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Copied from Debian
From 40a5955cbf0df62b1f9e9bd7d9657b0070725d19 Mon Sep 17 00:00:00 2001
From: erouault <erouault>
Date: Mon, 29 Dec 2014 12:09:11 +0000
Subject: [PATCH] * libtiff/tif_next.c: add new tests to check that we don't
read outside of the compressed input stream buffer.
* libtiff/tif_getimage.c: in OJPEG case, fix checks on strile width/height
---
ChangeLog | 9 +++++++++
libtiff/tif_getimage.c | 12 +++++++-----
libtiff/tif_next.c | 4 +++-
3 files changed, 19 insertions(+), 6 deletions(-)
diff --git a/libtiff/tif_getimage.c b/libtiff/tif_getimage.c
index a4f46d9..3ad8ee7 100644
--- a/libtiff/tif_getimage.c
+++ b/libtiff/tif_getimage.c
@@ -1871,7 +1871,7 @@ DECLAREContigPutFunc(putcontig8bitYCbCr42tile)
(void) y;
fromskew = (fromskew * 10) / 4;
- if ((h & 3) == 0 && (w & 1) == 0) {
+ if ((w & 3) == 0 && (h & 1) == 0) {
for (; h >= 2; h -= 2) {
x = w>>2;
do {
@@ -1948,7 +1948,7 @@ DECLAREContigPutFunc(putcontig8bitYCbCr41tile)
/* XXX adjust fromskew */
do {
x = w>>2;
- do {
+ while(x>0) {
int32 Cb = pp[4];
int32 Cr = pp[5];
@@ -1959,7 +1959,8 @@ DECLAREContigPutFunc(putcontig8bitYCbCr41tile)
cp += 4;
pp += 6;
- } while (--x);
+ x--;
+ }
if( (w&3) != 0 )
{
@@ -2050,7 +2051,7 @@ DECLAREContigPutFunc(putcontig8bitYCbCr21tile)
fromskew = (fromskew * 4) / 2;
do {
x = w>>1;
- do {
+ while(x>0) {
int32 Cb = pp[2];
int32 Cr = pp[3];
@@ -2059,7 +2060,8 @@ DECLAREContigPutFunc(putcontig8bitYCbCr21tile)
cp += 2;
pp += 4;
- } while (--x);
+ x --;
+ }
if( (w&1) != 0 )
{
diff --git a/libtiff/tif_next.c b/libtiff/tif_next.c
index d834196..dd669cc 100644
--- a/libtiff/tif_next.c
+++ b/libtiff/tif_next.c
@@ -71,7 +71,7 @@ NeXTDecode(TIFF* tif, uint8* buf, tmsize_t occ, uint16 s)
TIFFErrorExt(tif->tif_clientdata, module, "Fractional scanlines cannot be read");
return (0);
}
- for (row = buf; occ > 0; occ -= scanline, row += scanline) {
+ for (row = buf; cc > 0 && occ > 0; occ -= scanline, row += scanline) {
n = *bp++, cc--;
switch (n) {
case LITERALROW:
@@ -90,6 +90,8 @@ NeXTDecode(TIFF* tif, uint8* buf, tmsize_t occ, uint16 s)
* The scanline has a literal span that begins at some
* offset.
*/
+ if( cc < 4 )
+ goto bad;
off = (bp[0] * 256) + bp[1];
n = (bp[2] * 256) + bp[3];
if (cc < 4+n || off+n > scanline)
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