[FFmpeg-devel] [PATCH] mjpegdec: ensure SOF before SOS/EOI

[Reimar Döffinger]

Hello,
this fixes issue1240, mjpeg/smclockmjpeg.avi.1.0
The problem is, it reaches EOI before SOF, thus get_buffer was
never called and the picture it returns has invalid values for
data[] (NULL in this case, but it could be values from a previous
frame which still would be wrong).
This could also happen, if avcodec_check_dimensions failed, which
might make this even more of an issue.
Attached patch fixes it and also protects the decode_sos part so
it will only be called with a valid picture.
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