[FFmpeg-trac] #4515(avcodec:new): ffv1enc.c can reference an uninitialized variable

[FFmpeg]

#4515: ffv1enc.c can reference an uninitialized variable
---------------------------------------+---------------------------------
               Reporter:  jeremyhu     |                  Owner:
                   Type:  defect       |                 Status:  new
               Priority:  normal       |              Component:  avcodec
                Version:  unspecified  |               Keywords:
             Blocked By:               |               Blocking:
Reproduced by developer:  0            |  Analyzed by developer:  0
---------------------------------------+---------------------------------
 As observed in:

 http://fate.ffmpeg.org/log.cgi?time=20150426121301&log=compile&slot=x86_64
 -darwin-clang-3.7

 {{{
 /Users/jeremy/src/ffmpeg/fate/x86_64-darwin-
 clang-3.7/src/libavcodec/ffv1enc.c:430:17: warning: variable 'a' is used
 uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
             if (lbd) {
                 ^~~
 /Users/jeremy/src/ffmpeg/fate/x86_64-darwin-
 clang-3.7/src/libavcodec/ffv1enc.c:453:31: note: uninitialized use occurs
 here
             sample[3][0][x] = a;
                               ^
 /Users/jeremy/src/ffmpeg/fate/x86_64-darwin-
 clang-3.7/src/libavcodec/ffv1enc.c:430:13: note: remove the 'if' if its
 condition is always true
             if (lbd) {
             ^~~~~~~~~
 /Users/jeremy/src/ffmpeg/fate/x86_64-darwin-
 clang-3.7/src/libavcodec/ffv1enc.c:429:13: note: variable 'a' is declared
 here
             int b, g, r, av_uninit(a);
             ^
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/4515>
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