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snow_dwt: Don't try and free members of non-existent arrays 

If allocation fails earlier on, and the next frame is processed,
the slice buffer could be left in a state where line and data_stack
have already been freed, or are otherwise null pointers.

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
This commit is contained in:
Derek Buitenhuis 2014-12-15 17:59:08 -05:00
parent 0a7964dca5
commit 402a61c919
1 changed files with 7 additions and 2 deletions
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9
libavcodec/snow_dwt.c
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@ -91,6 +91,10 @@ void ff_slice_buffer_release(slice_buffer *buf, int line)
void ff_slice_buffer_flush(slice_buffer *buf)
{
int i;
if (!buf->line)
return;
for (i = 0; i < buf->line_count; i++)
if (buf->line[i])
ff_slice_buffer_release(buf, i);
@ -101,8 +105,9 @@ void ff_slice_buffer_destroy(slice_buffer *buf)
int i;
ff_slice_buffer_flush(buf);
for (i = buf->data_count - 1; i >= 0; i--)
av_freep(&buf->data_stack[i]);
if (buf->data_stack)
for (i = buf->data_count - 1; i >= 0; i--)
av_freep(&buf->data_stack[i]);
av_freep(&buf->data_stack);
av_freep(&buf->line);
}