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Fix a buffer overflow in libx264 interface to x264 encoder. Previous code ignored the compressed buffer size passed in. This change returns as many complete NALs as can fit in the buffer, and logs an error message.

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Signed-off-by: Mike Scheutzow <mike.scheutzow@alcatel-lucent.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Mike Scheutzow 2011-09-26 10:57:53 -04:00 committed by Michael Niedermayer
parent cbf914cf16
commit e2dae1faa8
1 changed files with 10 additions and 0 deletions
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10
libavcodec/libx264.c
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@ -96,9 +96,14 @@ static int encode_nals(AVCodecContext *ctx, uint8_t *buf, int size,
/* Write the SEI as part of the first frame. */
if (x4->sei_size > 0 && nnal > 0) {
if (x4->sei_size > size) {
av_log(ctx, AV_LOG_ERROR, "Error: nal buffer is too small\n");
return -1;
}
memcpy(p, x4->sei, x4->sei_size);
p += x4->sei_size;
x4->sei_size = 0;
// why is x4->sei not freed?
}
for (i = 0; i < nnal; i++){
@ -109,6 +114,11 @@ static int encode_nals(AVCodecContext *ctx, uint8_t *buf, int size,
memcpy(x4->sei, nals[i].p_payload, nals[i].i_payload);
continue;
}
if (nals[i].i_payload > (size - (p - buf))) {
// return only complete nals which fit in buf
av_log(ctx, AV_LOG_ERROR, "Error: nal buffer is too small\n");
break;
}
memcpy(p, nals[i].p_payload, nals[i].i_payload);
p += nals[i].i_payload;
}