From 848e5cfc0f7ef0eae410562c3d7f7744a83aae9b Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Sat, 24 Aug 2013 03:19:40 +0200 Subject: [PATCH] jpeg2000: check log2_cblk dimensions Fixes out of array access Fixes Ticket2895 Found-by: Piotr Bandurski Signed-off-by: Michael Niedermayer (cherry picked from commit 9a271a9368eaabf99e6c2046103acb33957e63b7) Conflicts: libavcodec/jpeg2000dec.c Signed-off-by: Michael Niedermayer --- libavcodec/j2kdec.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/libavcodec/j2kdec.c b/libavcodec/j2kdec.c index 53c4f079f8..d086de731f 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));