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8ca2e9 |
Upstream patch for CVE-2012-4447. This also covers an out-of-bounds-read
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possibility in the same file, which wasn't given a separate CVE.
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diff -Naur tiff-3.9.4.orig/libtiff/tif_pixarlog.c tiff-3.9.4/libtiff/tif_pixarlog.c
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8ca2e9 |
--- tiff-3.9.4.orig/libtiff/tif_pixarlog.c 2010-06-08 14:50:42.000000000 -0400
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+++ tiff-3.9.4/libtiff/tif_pixarlog.c 2012-12-10 15:50:14.421538317 -0500
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8ca2e9 |
@@ -117,9 +117,9 @@
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if (n >= stride) {
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mask = CODE_MASK;
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if (stride == 3) {
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- t0 = ToLinearF[cr = wp[0]];
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- t1 = ToLinearF[cg = wp[1]];
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- t2 = ToLinearF[cb = wp[2]];
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+ t0 = ToLinearF[cr = (wp[0] & mask)];
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+ t1 = ToLinearF[cg = (wp[1] & mask)];
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+ t2 = ToLinearF[cb = (wp[2] & mask)];
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op[0] = t0;
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op[1] = t1;
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op[2] = t2;
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8ca2e9 |
@@ -136,10 +136,10 @@
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op[2] = t2;
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}
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} else if (stride == 4) {
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- t0 = ToLinearF[cr = wp[0]];
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- t1 = ToLinearF[cg = wp[1]];
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- t2 = ToLinearF[cb = wp[2]];
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- t3 = ToLinearF[ca = wp[3]];
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+ t0 = ToLinearF[cr = (wp[0] & mask)];
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+ t1 = ToLinearF[cg = (wp[1] & mask)];
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+ t2 = ToLinearF[cb = (wp[2] & mask)];
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+ t3 = ToLinearF[ca = (wp[3] & mask)];
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op[0] = t0;
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op[1] = t1;
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op[2] = t2;
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8ca2e9 |
@@ -183,9 +183,9 @@
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if (n >= stride) {
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mask = CODE_MASK;
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if (stride == 3) {
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- t0 = ToLinearF[cr = wp[0]] * SCALE12;
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- t1 = ToLinearF[cg = wp[1]] * SCALE12;
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- t2 = ToLinearF[cb = wp[2]] * SCALE12;
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+ t0 = ToLinearF[cr = (wp[0] & mask)] * SCALE12;
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+ t1 = ToLinearF[cg = (wp[1] & mask)] * SCALE12;
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+ t2 = ToLinearF[cb = (wp[2] & mask)] * SCALE12;
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op[0] = CLAMP12(t0);
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op[1] = CLAMP12(t1);
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op[2] = CLAMP12(t2);
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8ca2e9 |
@@ -202,10 +202,10 @@
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op[2] = CLAMP12(t2);
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}
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} else if (stride == 4) {
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- t0 = ToLinearF[cr = wp[0]] * SCALE12;
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8ca2e9 |
- t1 = ToLinearF[cg = wp[1]] * SCALE12;
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- t2 = ToLinearF[cb = wp[2]] * SCALE12;
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- t3 = ToLinearF[ca = wp[3]] * SCALE12;
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+ t0 = ToLinearF[cr = (wp[0] & mask)] * SCALE12;
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+ t1 = ToLinearF[cg = (wp[1] & mask)] * SCALE12;
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+ t2 = ToLinearF[cb = (wp[2] & mask)] * SCALE12;
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+ t3 = ToLinearF[ca = (wp[3] & mask)] * SCALE12;
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8ca2e9 |
op[0] = CLAMP12(t0);
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op[1] = CLAMP12(t1);
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op[2] = CLAMP12(t2);
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8ca2e9 |
@@ -247,9 +247,9 @@
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8ca2e9 |
if (n >= stride) {
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mask = CODE_MASK;
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if (stride == 3) {
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- op[0] = ToLinear16[cr = wp[0]];
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- op[1] = ToLinear16[cg = wp[1]];
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- op[2] = ToLinear16[cb = wp[2]];
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+ op[0] = ToLinear16[cr = (wp[0] & mask)];
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+ op[1] = ToLinear16[cg = (wp[1] & mask)];
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+ op[2] = ToLinear16[cb = (wp[2] & mask)];
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n -= 3;
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while (n > 0) {
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wp += 3;
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@@ -260,10 +260,10 @@
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op[2] = ToLinear16[(cb += wp[2]) & mask];
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}
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} else if (stride == 4) {
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- op[0] = ToLinear16[cr = wp[0]];
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- op[1] = ToLinear16[cg = wp[1]];
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- op[2] = ToLinear16[cb = wp[2]];
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- op[3] = ToLinear16[ca = wp[3]];
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+ op[0] = ToLinear16[cr = (wp[0] & mask)];
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+ op[1] = ToLinear16[cg = (wp[1] & mask)];
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+ op[2] = ToLinear16[cb = (wp[2] & mask)];
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+ op[3] = ToLinear16[ca = (wp[3] & mask)];
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n -= 4;
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while (n > 0) {
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wp += 4;
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@@ -342,9 +342,9 @@
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if (n >= stride) {
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mask = CODE_MASK;
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if (stride == 3) {
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- op[0] = ToLinear8[cr = wp[0]];
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- op[1] = ToLinear8[cg = wp[1]];
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- op[2] = ToLinear8[cb = wp[2]];
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+ op[0] = ToLinear8[cr = (wp[0] & mask)];
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+ op[1] = ToLinear8[cg = (wp[1] & mask)];
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+ op[2] = ToLinear8[cb = (wp[2] & mask)];
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n -= 3;
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while (n > 0) {
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n -= 3;
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@@ -355,10 +355,10 @@
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op[2] = ToLinear8[(cb += wp[2]) & mask];
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}
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} else if (stride == 4) {
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- op[0] = ToLinear8[cr = wp[0]];
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- op[1] = ToLinear8[cg = wp[1]];
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- op[2] = ToLinear8[cb = wp[2]];
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- op[3] = ToLinear8[ca = wp[3]];
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+ op[0] = ToLinear8[cr = (wp[0] & mask)];
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+ op[1] = ToLinear8[cg = (wp[1] & mask)];
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+ op[2] = ToLinear8[cb = (wp[2] & mask)];
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+ op[3] = ToLinear8[ca = (wp[3] & mask)];
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n -= 4;
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while (n > 0) {
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n -= 4;
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8ca2e9 |
@@ -393,9 +393,9 @@
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mask = CODE_MASK;
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if (stride == 3) {
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op[0] = 0;
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- t1 = ToLinear8[cb = wp[2]];
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- t2 = ToLinear8[cg = wp[1]];
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- t3 = ToLinear8[cr = wp[0]];
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+ t1 = ToLinear8[cb = (wp[2] & mask)];
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+ t2 = ToLinear8[cg = (wp[1] & mask)];
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+ t3 = ToLinear8[cr = (wp[0] & mask)];
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op[1] = t1;
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op[2] = t2;
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op[3] = t3;
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@@ -413,10 +413,10 @@
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op[3] = t3;
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}
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} else if (stride == 4) {
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- t0 = ToLinear8[ca = wp[3]];
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- t1 = ToLinear8[cb = wp[2]];
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- t2 = ToLinear8[cg = wp[1]];
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- t3 = ToLinear8[cr = wp[0]];
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+ t0 = ToLinear8[ca = (wp[3] & mask)];
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+ t1 = ToLinear8[cb = (wp[2] & mask)];
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+ t2 = ToLinear8[cg = (wp[1] & mask)];
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+ t3 = ToLinear8[cr = (wp[0] & mask)];
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op[0] = t0;
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op[1] = t1;
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op[2] = t2;
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@@ -630,10 +630,10 @@
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return guess;
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}
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-static uint32
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-multiply(size_t m1, size_t m2)
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+static tsize_t
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+multiply(tsize_t m1, tsize_t m2)
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{
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- uint32 bytes = m1 * m2;
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+ tsize_t bytes = m1 * m2;
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if (m1 && bytes / m1 != m2)
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bytes = 0;
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8ca2e9 |
@@ -641,6 +641,20 @@
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return bytes;
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}
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+static tsize_t
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+add_ms(tsize_t m1, tsize_t m2)
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+{
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+ tsize_t bytes = m1 + m2;
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+
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+ /* if either input is zero, assume overflow already occurred */
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+ if (m1 == 0 || m2 == 0)
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+ bytes = 0;
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+ else if (bytes <= m1 || bytes <= m2)
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+ bytes = 0;
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+
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+ return bytes;
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+}
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+
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8ca2e9 |
static int
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8ca2e9 |
PixarLogSetupDecode(TIFF* tif)
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{
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8ca2e9 |
@@ -661,6 +675,8 @@
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td->td_samplesperpixel : 1);
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tbuf_size = multiply(multiply(multiply(sp->stride, td->td_imagewidth),
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td->td_rowsperstrip), sizeof(uint16));
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8ca2e9 |
+ /* add one more stride in case input ends mid-stride */
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+ tbuf_size = add_ms(tbuf_size, sizeof(uint16) * sp->stride);
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8ca2e9 |
if (tbuf_size == 0)
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return (0);
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8ca2e9 |
sp->tbuf = (uint16 *) _TIFFmalloc(tbuf_size);
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