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avpacket: fix size check in packet_alloc 

The previous check only caught sizes from -AV_INPUT_BUFFER_PADDING_SIZE
to -1.

This fixes ubsan runtime error: signed integer overflow: 2147483647 + 32
cannot be represented in type 'int'

Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
Signed-off-by: Anton Khirnov <anton@khirnov.net>
This commit is contained in:
Andreas Cadhalpun 2016-01-05 13:05:50 +01:00 committed by Anton Khirnov
parent 066281372d
commit fa463aa83a
1 changed files with 1 additions and 1 deletions
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2
libavcodec/avpacket.c
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@ -69,7 +69,7 @@ void av_packet_free(AVPacket **pkt)
static int packet_alloc(AVBufferRef **buf, int size)
{
int ret;
if ((unsigned)size >= (unsigned)size + AV_INPUT_BUFFER_PADDING_SIZE)
if (size < 0 || size >= INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE)
return AVERROR(EINVAL);
ret = av_buffer_realloc(buf, size + AV_INPUT_BUFFER_PADDING_SIZE);