avcodec/vc1dec: Check source picture availability in vc1_mc_4mv_chroma4()
authorMichael Niedermayer <michaelni@gmx.at>
Sat, 15 Jun 2013 11:10:43 +0000 (13:10 +0200)
committerMichael Niedermayer <michaelni@gmx.at>
Sat, 15 Jun 2013 11:11:35 +0000 (13:11 +0200)
commit6c4516d0413ea9b2a9b48fb83d0ba0ef7bc84f92
tree4caf2c97a17fa345820d61ae98902d4c8c83bed1
parent1ba196a10d1d0bddc2fd7774dd7b95716bbdb7bf
avcodec/vc1dec: Check source picture availability in vc1_mc_4mv_chroma4()

Fixes null pointer dereference

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
libavcodec/vc1dec.c