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Code Issues Releases Activity

mov: Don't av_malloc(0).

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malloc() is allowed to return NULL when zero is the argument. This
causes us to think malloc has failed and return AVERROR(ENOMEM). In
addition OS X malloc() returns an unfreeable non-NULL pointer for size
zero when alignment is greater than 16.
This commit is contained in:
Alex Converse 2011-12-04 16:38:05 -08:00
parent 9179f27c64
commit 52401b82bd
1 changed files with 10 additions and 0 deletions
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10
libavformat/mov.c
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@ -915,6 +915,8 @@ static int mov_read_stco(MOVContext *c, AVIOContext *pb, MOVAtom atom)
entries = avio_rb32(pb);
if (!entries)
return 0;
if (entries >= UINT_MAX/sizeof(int64_t))
return -1;
@ -1336,6 +1338,8 @@ static int mov_read_stsc(MOVContext *c, AVIOContext *pb, MOVAtom atom)
av_dlog(c->fc, "track[%i].stsc.entries = %i\n", c->fc->nb_streams-1, entries);
if (!entries)
return 0;
if (entries >= UINT_MAX / sizeof(*sc->stsc_data))
return -1;
sc->stsc_data = av_malloc(entries * sizeof(*sc->stsc_data));
@ -1451,6 +1455,8 @@ static int mov_read_stsz(MOVContext *c, AVIOContext *pb, MOVAtom atom)
return -1;
}
if (!entries)
return 0;
if (entries >= UINT_MAX / sizeof(int) || entries >= (UINT_MAX - 4) / field_size)
return -1;
sc->sample_sizes = av_malloc(entries * sizeof(int));
@ -1550,6 +1556,8 @@ static int mov_read_ctts(MOVContext *c, AVIOContext *pb, MOVAtom atom)
av_dlog(c->fc, "track[%i].ctts.entries = %i\n", c->fc->nb_streams-1, entries);
if (!entries)
return 0;
if (entries >= UINT_MAX / sizeof(*sc->ctts_data))
return -1;
sc->ctts_data = av_malloc(entries * sizeof(*sc->ctts_data));
@ -1609,6 +1617,8 @@ static void mov_build_index(MOVContext *mov, AVStream *st)
current_dts -= sc->dts_shift;
if (!sc->sample_count)
return;
if (sc->sample_count >= UINT_MAX / sizeof(*st->index_entries))
return;
st->index_entries = av_malloc(sc->sample_count*sizeof(*st->index_entries));