diff options
| author | Michael Niedermayer <michaelni@gmx.at> | 2014-12-16 21:14:40 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2014-12-16 23:57:22 +0100 |
| commit | 3aa99bed5df3f5da0e3b4d871eb197b028cf1f4d (patch) | |
| tree | 1c9cfbdcfdd53537b1cd910e67ce3ed86d222c96 | |
| parent | ece0c9c4b04257d8ba3689987251f44421b1ead7 (diff) | |
| download | ffmpeg-3aa99bed5df3f5da0e3b4d871eb197b028cf1f4d.tar.gz | |
avformat/mov: check atom nesting depth
Fixes call stack overflow
Fixes: case1_call_stack_overflow.mp4
Found-by: Michal Zalewski <lcamtuf@coredump.cx>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit caa7a3914f499f74b3ee346f26d598ebdc0ec210)
Conflicts:
libavformat/isom.h
| -rw-r--r-- | libavformat/isom.h | 1 | ||||
| -rw-r--r-- | libavformat/mov.c | 13 |
2 files changed, 13 insertions, 1 deletions
diff --git a/libavformat/isom.h b/libavformat/isom.h index 4154baf827..c9004771bb 100644 --- a/libavformat/isom.h +++ b/libavformat/isom.h @@ -162,6 +162,7 @@ typedef struct MOVContext { int use_absolute_path; int ignore_editlist; int64_t next_root_atom; ///< offset of the next root atom + int atom_depth; } MOVContext; int ff_mp4_read_descr_len(AVIOContext *pb); diff --git a/libavformat/mov.c b/libavformat/mov.c index c2d2a07893..a1694a58cc 100644 --- a/libavformat/mov.c +++ b/libavformat/mov.c @@ -2788,6 +2788,12 @@ static int mov_read_default(MOVContext *c, AVIOContext *pb, MOVAtom atom) MOVAtom a; int i; + if (c->atom_depth > 10) { + av_log(c->fc, AV_LOG_ERROR, "Atoms too deeply nested\n"); + return AVERROR_INVALIDDATA; + } + c->atom_depth ++; + if (atom.size < 0) atom.size = INT64_MAX; while (total_size + 8 <= atom.size && !url_feof(pb)) { @@ -2804,6 +2810,7 @@ static int mov_read_default(MOVContext *c, AVIOContext *pb, MOVAtom atom) { av_log(c->fc, AV_LOG_ERROR, "Broken file, trak/mdat not at top-level\n"); avio_skip(pb, -8); + c->atom_depth --; return 0; } } @@ -2840,13 +2847,16 @@ static int mov_read_default(MOVContext *c, AVIOContext *pb, MOVAtom atom) int64_t start_pos = avio_tell(pb); int64_t left; int err = parse(c, pb, a); - if (err < 0) + if (err < 0) { + c->atom_depth --; return err; + } if (c->found_moov && c->found_mdat && ((!pb->seekable || c->fc->flags & AVFMT_FLAG_IGNIDX) || start_pos + a.size == avio_size(pb))) { if (!pb->seekable || c->fc->flags & AVFMT_FLAG_IGNIDX) c->next_root_atom = start_pos + a.size; + c->atom_depth --; return 0; } left = a.size - avio_tell(pb) + start_pos; @@ -2864,6 +2874,7 @@ static int mov_read_default(MOVContext *c, AVIOContext *pb, MOVAtom atom) if (total_size < atom.size && atom.size < 0x7ffff) avio_skip(pb, atom.size - total_size); + c->atom_depth --; return 0; } |