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eacmv: Make sure a reference frame exists before referencing it

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This is similar to an existing check for the second-last frame
from 062421e3.

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
Signed-off-by: Martin Storsjö <martin@martin.st>
(cherry picked from commit ea78a348d8)
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

Conflicts:
	libavcodec/eacmv.c
This commit is contained in:
Martin Storsjö
2013-09-16 21:07:30 +03:00
committed by Luca Barbato
parent c8c93795e4
commit 2e12af4587
1 changed files with 4 additions and 3 deletions
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7
libavcodec/eacmv.c
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@@ -108,9 +108,10 @@ static void cmv_decode_inter(CmvContext * s, const uint8_t *buf, const uint8_t *
}else{ /* inter using last frame as reference */
int xoffset = (buf[i] & 0xF) - 7;
int yoffset = ((buf[i] >> 4)) - 7;
cmv_motcomp(s->frame.data[0], s->frame.linesize[0],
s->last_frame.data[0], s->last_frame.linesize[0],
x*4, y*4, xoffset, yoffset, s->avctx->width, s->avctx->height);
if (s->last_frame.data[0])
cmv_motcomp(s->frame.data[0], s->frame.linesize[0],
s->last_frame.data[0], s->last_frame.linesize[0],
x*4, y*4, xoffset, yoffset, s->avctx->width, s->avctx->height);
}
i++;
}