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From 24f099951c3a86f04a29adc7b0dda474a3c44722 Mon Sep 17 00:00:00 2001
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From: Nils Philippsen <nils@redhat.com>
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Date: Wed, 25 Sep 2013 15:04:43 +0200
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Subject: [PATCH] CVE-2013-1438: fix various security issues
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This fixes division by zero, infinite loop, and null pointer dereference
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bugs. Ported from Alex Tutubalin's fix in LibRaw (commit
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9ae25d8c3a6bfb40c582538193264f74c9b93bc0).
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---
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dcraw.c | 33 ++++++++++++++++++++++++---------
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1 file changed, 24 insertions(+), 9 deletions(-)
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diff --git a/dcraw.c b/dcraw.c
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index 96e3d1f..dcf284c 100644
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--- a/dcraw.c
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+++ b/dcraw.c
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@@ -828,6 +828,9 @@ int CLASS ljpeg_diff (ushort *huff)
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{
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int len, diff;
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+ if (!huff)
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+ longjmp(failure, 2);
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+
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len = gethuff(huff);
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if (len == 16 && (!dng_version || dng_version >= 0x1010000))
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return -32768;
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@@ -883,6 +886,8 @@ void CLASS lossless_jpeg_load_raw()
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ushort *rp;
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if (!ljpeg_start (&jh, 0)) return;
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+ if (jh.wide < 1 || jh.high < 1 || jh.clrs < 1 || jh.bits < 1)
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+ longjmp (failure, 2);
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jwide = jh.wide * jh.clrs;
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for (jrow=0; jrow < jh.high; jrow++) {
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@@ -902,6 +907,8 @@ void CLASS lossless_jpeg_load_raw()
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}
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if (raw_width == 3984 && (col -= 2) < 0)
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col += (row--,raw_width);
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+ if (row > raw_height)
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+ longjmp (failure, 3);
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if ((unsigned) row < raw_height) RAW(row,col) = val;
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if (++col >= raw_width)
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col = (row++,0);
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@@ -5444,6 +5451,7 @@ int CLASS parse_tiff_ifd (int base)
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data_offset = get4()+base;
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ifd++; break;
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}
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+ if(len > 1000) len=1000; /* 1000 SubIFDs is enough */
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while (len--) {
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i = ftell(ifp);
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fseek (ifp, get4()+base, SEEK_SET);
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@@ -5662,7 +5670,7 @@ guess_cfa_pc:
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break;
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case 50715: /* BlackLevelDeltaH */
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case 50716: /* BlackLevelDeltaV */
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- for (num=i=0; i < len; i++)
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+ for (num=i=0; i < len && i < 65536; i++)
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num += getreal(type);
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black += num/len + 0.5;
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break;
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@@ -5787,9 +5795,13 @@ void CLASS apply_tiff()
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if (thumb_offset) {
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fseek (ifp, thumb_offset, SEEK_SET);
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if (ljpeg_start (&jh, 1)) {
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- thumb_misc = jh.bits;
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- thumb_width = jh.wide;
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- thumb_height = jh.high;
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+ if ((unsigned)jh.bits < 17 && (unsigned)jh.wide < 0x10000 &&
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+ (unsigned)jh.high < 0x10000)
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+ {
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+ thumb_misc = jh.bits;
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+ thumb_width = jh.wide;
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+ thumb_height = jh.high;
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+ }
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}
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}
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for (i=0; i < tiff_nifds; i++) {
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@@ -5797,8 +5809,9 @@ void CLASS apply_tiff()
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max_samp = tiff_ifd[i].samples;
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if (max_samp > 3) max_samp = 3;
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if ((tiff_ifd[i].comp != 6 || tiff_ifd[i].samples != 3) &&
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- (tiff_ifd[i].width | tiff_ifd[i].height) < 0x10000 &&
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- tiff_ifd[i].width*tiff_ifd[i].height > raw_width*raw_height) {
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+ (tiff_ifd[i].width | tiff_ifd[i].height) < 0x10000 &&
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+ (unsigned)tiff_ifd[i].bps < 33 && (unsigned)tiff_ifd[i].samples < 13 &&
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+ tiff_ifd[i].width*tiff_ifd[i].height > raw_width*raw_height) {
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raw_width = tiff_ifd[i].width;
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raw_height = tiff_ifd[i].height;
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tiff_bps = tiff_ifd[i].bps;
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@@ -5884,9 +5897,11 @@ void CLASS apply_tiff()
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is_raw = 0;
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for (i=0; i < tiff_nifds; i++)
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if (i != raw && tiff_ifd[i].samples == max_samp &&
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- tiff_ifd[i].width * tiff_ifd[i].height / (SQR(tiff_ifd[i].bps)+1) >
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- thumb_width * thumb_height / (SQR(thumb_misc)+1)
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- && tiff_ifd[i].comp != 34892) {
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+ tiff_ifd[i].bps > 0 && tiff_ifd[i].bps < 33 &&
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+ ((unsigned)(tiff_ifd[i].width | tiff_ifd[i].height)) < 0x10000 &&
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+ tiff_ifd[i].width * tiff_ifd[i].height / (SQR(tiff_ifd[i].bps)+1) >
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+ thumb_width * thumb_height / (SQR(thumb_misc)+1)
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+ && tiff_ifd[i].comp != 34892) {
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thumb_width = tiff_ifd[i].width;
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thumb_height = tiff_ifd[i].height;
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thumb_offset = tiff_ifd[i].offset;
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--
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1.8.4.2
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