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From 44ef4d3a8e92171f7470620649e8911a8056297c Mon Sep 17 00:00:00 2001
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From: Even Rouault <even.rouault@spatialys.com>
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Date: Tue, 30 Oct 2018 18:50:27 +0100
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Subject: [PATCH] (CVE-2018-18661) tiff2bw: avoid null pointer dereference in
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case of out of memory situation. Fixes
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http://bugzilla.maptools.org/show_bug.cgi?id=2819 / CVE-2018-18661
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(cherry picked from commit 99b10edde9a0fc28cc0e7b7757aa18ac4c8c225f)
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---
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libtiff/tiffiop.h | 1 +
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tools/tiff2bw.c | 30 ++++++++++++++++++++++++++----
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tools/tiffcrop.c | 5 -----
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3 files changed, 27 insertions(+), 9 deletions(-)
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diff --git a/libtiff/tiffiop.h b/libtiff/tiffiop.h
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index daa291c0..08e5dc44 100644
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--- a/libtiff/tiffiop.h
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+++ b/libtiff/tiffiop.h
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@@ -72,6 +72,7 @@ extern int snprintf(char* str, size_t size, const char* format, ...);
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#endif
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#define streq(a,b) (strcmp(a,b) == 0)
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+#define strneq(a,b,n) (strncmp(a,b,n) == 0)
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#ifndef TRUE
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#define TRUE 1
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diff --git a/tools/tiff2bw.c b/tools/tiff2bw.c
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index dad54afa..1f3bb2cd 100644
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--- a/tools/tiff2bw.c
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+++ b/tools/tiff2bw.c
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@@ -40,9 +40,7 @@
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#endif
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#include "tiffio.h"
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-
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-#define streq(a,b) (strcmp((a),(b)) == 0)
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-#define strneq(a,b,n) (strncmp(a,b,n) == 0)
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+#include "tiffiop.h"
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/* x% weighting -> fraction of full color */
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#define PCT(x) (((x)*256+50)/100)
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@@ -223,6 +221,11 @@ main(int argc, char* argv[])
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TIFFSetField(out, TIFFTAG_IMAGEDESCRIPTION, thing);
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TIFFSetField(out, TIFFTAG_SOFTWARE, "tiff2bw");
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outbuf = (unsigned char *)_TIFFmalloc(TIFFScanlineSize(out));
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+ if( !outbuf )
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+ {
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+ fprintf(stderr, "Out of memory\n");
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+ goto tiff2bw_error;
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+ }
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TIFFSetField(out, TIFFTAG_ROWSPERSTRIP,
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TIFFDefaultStripSize(out, rowsperstrip));
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@@ -246,6 +249,11 @@ main(int argc, char* argv[])
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#undef CVT
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}
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inbuf = (unsigned char *)_TIFFmalloc(TIFFScanlineSize(in));
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+ if( !inbuf )
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+ {
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+ fprintf(stderr, "Out of memory\n");
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+ goto tiff2bw_error;
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+ }
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for (row = 0; row < h; row++) {
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if (TIFFReadScanline(in, inbuf, row, 0) < 0)
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break;
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@@ -256,6 +264,11 @@ main(int argc, char* argv[])
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break;
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case pack(PHOTOMETRIC_RGB, PLANARCONFIG_CONTIG):
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inbuf = (unsigned char *)_TIFFmalloc(TIFFScanlineSize(in));
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+ if( !inbuf )
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+ {
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+ fprintf(stderr, "Out of memory\n");
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+ goto tiff2bw_error;
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+ }
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for (row = 0; row < h; row++) {
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if (TIFFReadScanline(in, inbuf, row, 0) < 0)
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break;
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@@ -265,8 +278,16 @@ main(int argc, char* argv[])
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}
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break;
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case pack(PHOTOMETRIC_RGB, PLANARCONFIG_SEPARATE):
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+ {
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+ tmsize_t inbufsize;
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rowsize = TIFFScanlineSize(in);
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- inbuf = (unsigned char *)_TIFFmalloc(3*rowsize);
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+ inbufsize = TIFFSafeMultiply(tmsize_t, 3, rowsize);
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+ inbuf = (unsigned char *)_TIFFmalloc(inbufsize);
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+ if( !inbuf )
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+ {
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+ fprintf(stderr, "Out of memory\n");
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+ goto tiff2bw_error;
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+ }
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for (row = 0; row < h; row++) {
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for (s = 0; s < 3; s++)
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if (TIFFReadScanline(in,
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@@ -278,6 +299,7 @@ main(int argc, char* argv[])
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break;
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}
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break;
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+ }
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}
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#undef pack
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if (inbuf)
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diff --git a/tools/tiffcrop.c b/tools/tiffcrop.c
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index c60cb389..3862b1ca 100644
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--- a/tools/tiffcrop.c
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+++ b/tools/tiffcrop.c
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@@ -150,11 +150,6 @@ extern int getopt(int argc, char * const argv[], const char *optstring);
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#define TIFF_UINT32_MAX 0xFFFFFFFFU
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-#ifndef streq
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-#define streq(a,b) (strcmp((a),(b)) == 0)
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-#endif
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-#define strneq(a,b,n) (strncmp((a),(b),(n)) == 0)
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-
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#define TRUE 1
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#define FALSE 0
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