[FFmpeg-devel] [PATCH] potential fix for memory underread issue in h264 predict

[Daniel Kang]

A VLC user (GomGom on freenode) has brought up a bug. h264's
pred8x8l_horizontal may underread a buffer in certain cases (i.e. if the
top row does not exist). The check for this has been moved up so the
buffer is not underread. The patch passes
fate-(h264|svq3|vp8|real-rv40), the tests relevant to this patch.

I believe this occurs when the flag emu_edge is set.

I cannot replicate the issue, so I am not sure if it is a correct fix.
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