[FFmpeg-cvslog] jpeg2000: check log2_cblk dimensions
Michael Niedermayer
git at videolan.org
Sun Aug 25 21:04:39 CEST 2013
ffmpeg | branch: release/1.2 | Michael Niedermayer <michaelni at gmx.at> | Sat Aug 24 03:19:40 2013 +0200| [848e5cfc0f7ef0eae410562c3d7f7744a83aae9b] | committer: Michael Niedermayer
jpeg2000: check log2_cblk dimensions
Fixes out of array access
Fixes Ticket2895
Found-by: Piotr Bandurski <ami_stuff at o2.pl>
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
(cherry picked from commit 9a271a9368eaabf99e6c2046103acb33957e63b7)
Conflicts:
libavcodec/jpeg2000dec.c
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=848e5cfc0f7ef0eae410562c3d7f7744a83aae9b
---
libavcodec/j2kdec.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/libavcodec/j2kdec.c b/libavcodec/j2kdec.c
index 53c4f07..d086de7 100644
--- a/libavcodec/j2kdec.c
+++ b/libavcodec/j2kdec.c
@@ -31,6 +31,7 @@
#include "bytestream.h"
#include "internal.h"
#include "j2k.h"
+#include "libavutil/avassert.h"
#include "libavutil/common.h"
#define JP2_SIG_TYPE 0x6A502020
@@ -302,6 +303,10 @@ static int get_cox(J2kDecoderContext *s, J2kCodingStyle *c)
c->log2_cblk_width = bytestream2_get_byteu(&s->g) + 2; // cblk width
c->log2_cblk_height = bytestream2_get_byteu(&s->g) + 2; // cblk height
+ if (c->log2_cblk_width > 6 || c->log2_cblk_height > 6) {
+ return AVERROR_PATCHWELCOME;
+ }
+
c->cblk_style = bytestream2_get_byteu(&s->g);
if (c->cblk_style != 0){ // cblk style
av_log(s->avctx, AV_LOG_WARNING, "extra cblk styles %X\n", c->cblk_style);
@@ -719,6 +724,9 @@ static int decode_cblk(J2kDecoderContext *s, J2kCodingStyle *codsty, J2kT1Contex
int bpass_csty_symbol = J2K_CBLK_BYPASS & codsty->cblk_style;
int vert_causal_ctx_csty_symbol = J2K_CBLK_VSC & codsty->cblk_style;
+ av_assert0(width <= J2K_MAX_CBLKW);
+ av_assert0(height <= J2K_MAX_CBLKH);
+
for (y = 0; y < height+2; y++)
memset(t1->flags[y], 0, (width+2)*sizeof(int));
More information about the ffmpeg-cvslog
mailing list