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avformat/oggdec: Check buf before copying data in to it 

Fixes null pointer dereference
Fixes: aace024653cc62947336b86f8de812ab_signal_sigsegv_a0500f_343_WobblyWindowsIntro.ogg with memlimit 262144

Found-by: Samuel Groß, Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2015-07-13 21:44:26 +02:00
parent 5d346feafa
commit 32d023eb6d
1 changed files with 10 additions and 2 deletions
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12
libavformat/oggdec.c
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@ -60,6 +60,7 @@ static const struct ogg_codec * const ogg_codecs[] = {
static int64_t ogg_calc_pts(AVFormatContext *s, int idx, int64_t *dts);
static int ogg_new_stream(AVFormatContext *s, uint32_t serial);
static int ogg_restore(AVFormatContext *s, int discard);
//FIXME We could avoid some structure duplication
static int ogg_save(AVFormatContext *s)
@ -68,6 +69,7 @@ static int ogg_save(AVFormatContext *s)
struct ogg_state *ost =
av_malloc(sizeof(*ost) + (ogg->nstreams - 1) * sizeof(*ogg->streams));
int i;
int ret = 0;
if (!ost)
return AVERROR(ENOMEM);
@ -81,14 +83,20 @@ static int ogg_save(AVFormatContext *s)
for (i = 0; i < ogg->nstreams; i++) {
struct ogg_stream *os = ogg->streams + i;
os->buf = av_mallocz(os->bufsize + FF_INPUT_BUFFER_PADDING_SIZE);
memcpy(os->buf, ost->streams[i].buf, os->bufpos);
if (os->buf)
memcpy(os->buf, ost->streams[i].buf, os->bufpos);
else
ret = AVERROR(ENOMEM);
os->new_metadata = NULL;
os->new_metadata_size = 0;
}
ogg->state = ost;
return 0;
if (ret < 0)
ogg_restore(s, 0);
return ret;
}
static int ogg_restore(AVFormatContext *s, int discard)