diff options
| author | Google Chrome <> | 2010-02-09 19:54:42 +0000 |
|---|---|---|
| committer | Reinhard Tartler <siretart@tauware.de> | 2010-02-09 19:54:42 +0000 |
| commit | 4f5ee3f87b143587309471e1c0fa804847939f65 (patch) | |
| tree | b1307847214dc7e9ab5c4fcaf65e4407e22d9339 | |
| parent | 736d36b79231d72699dce3449fc9d80c46d2aa19 (diff) | |
Check begin/end/partition_size.
23_vorbis_sane_partition.patch by chrome.
Also this should be better documented but i prefer not to leave potential
security issues open due to missing documentation.
r19996 by michael
Originally committed as revision 21729 to svn://svn.ffmpeg.org/ffmpeg/branches/0.5
| -rw-r--r-- | libavcodec/vorbis_dec.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/libavcodec/vorbis_dec.c b/libavcodec/vorbis_dec.c index e596d48d2c..b70d5a51c4 100644 --- a/libavcodec/vorbis_dec.c +++ b/libavcodec/vorbis_dec.c @@ -37,6 +37,7 @@ #define V_NB_BITS 8 #define V_NB_BITS2 11 #define V_MAX_VLCS (1<<16) +#define V_MAX_PARTITIONS (1<<20) #ifndef V_DEBUG #define AV_DEBUG(...) @@ -643,6 +644,14 @@ static int vorbis_parse_setup_hdr_residues(vorbis_context *vc){ res_setup->begin=get_bits(gb, 24); res_setup->end=get_bits(gb, 24); res_setup->partition_size=get_bits(gb, 24)+1; + /* Validations to prevent a buffer overflow later. */ + if (res_setup->begin>res_setup->end + || res_setup->end>vc->blocksize[1]/(res_setup->type==2?1:2) + || (res_setup->end-res_setup->begin)/res_setup->partition_size>V_MAX_PARTITIONS) { + av_log(vc->avccontext, AV_LOG_ERROR, "partition out of bounds: type, begin, end, size, blocksize: %d, %d, %d, %d, %d\n", res_setup->type, res_setup->begin, res_setup->end, res_setup->partition_size, vc->blocksize[1]/2); + return 1; + } + res_setup->classifications=get_bits(gb, 6)+1; res_setup->classbook=get_bits(gb, 8); if (res_setup->classbook>=vc->codebook_count) { |