proresdec_lgpl: explicitly check coff[3] against slice_data_size
authorAndreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
Wed, 9 Nov 2016 22:49:46 +0000 (23:49 +0100)
committerAndreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
Sat, 26 Nov 2016 23:38:56 +0000 (00:38 +0100)
commit416a8a06b977d8b3d113945701d9690abfdd7622
treebe13138c8cc776e7ce23fd1e16e7ab6021f3be09
parente14cc2f1975b608b630725007bda10f49aa096a1
proresdec_lgpl: explicitly check coff[3] against slice_data_size

The implicit checks via v_data_size and a_data_size don't work in the case
'(hdr_size > 7) && !ctx->alpha_info'.

This fixes segmentation faults due to invalid reads.

This problem was introduced in commit
547c2f002a87f4412a83c23b0d60364be5e7ce58.

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
(cherry picked from commit 1e33035ee7a8d9fb7a4b8b6cc54842e72b36ed70)
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
libavcodec/proresdec_lgpl.c