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avc: fix memory errors when encoding invalid h264 codecdata 

Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
This commit is contained in:
John Brooks 2011-11-09 20:14:19 -07:00 committed by Ronald S. Bultje
parent f1f6d3615f
commit 6c643e0705
1 changed files with 18 additions and 11 deletions
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29
libavformat/avc.c
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@ -75,8 +75,11 @@ int ff_avc_parse_nal_units(AVIOContext *pb, const uint8_t *buf_in, int size)
size = 0;
nal_start = ff_avc_find_startcode(p, end);
while (nal_start < end) {
while(!*(nal_start++));
for (;;) {
while (nal_start < end && !*(nal_start++));
if (nal_start == end)
break;
nal_end = ff_avc_find_startcode(nal_start, end);
avio_wb32(pb, nal_end - nal_start);
avio_write(pb, nal_start, nal_end - nal_start);
@ -117,22 +120,26 @@ int ff_isom_write_avcc(AVIOContext *pb, const uint8_t *data, int len)
end = buf + len;
/* look for sps and pps */
while (buf < end) {
unsigned int size;
while (end - buf > 4) {
uint32_t size;
uint8_t nal_type;
size = AV_RB32(buf);
nal_type = buf[4] & 0x1f;
size = FFMIN(AV_RB32(buf), end - buf - 4);
buf += 4;
nal_type = buf[0] & 0x1f;
if (nal_type == 7) { /* SPS */
sps = buf + 4;
sps = buf;
sps_size = size;
} else if (nal_type == 8) { /* PPS */
pps = buf + 4;
pps = buf;
pps_size = size;
}
buf += size + 4;
buf += size;
}
assert(sps);
assert(pps);
if (!sps || !pps || sps_size < 4 || sps_size > UINT16_MAX || pps_size > UINT16_MAX)
return AVERROR_INVALIDDATA;
avio_w8(pb, 1); /* version */
avio_w8(pb, sps[1]); /* profile */