On Sat, Nov 24, 2018 at 11:46:36AM +0100, Tomas Härdin wrote: > fre 2018-11-23 klockan 02:33 +0100 skrev Michael Niedermayer: > > Fixes: left shift of 255 by 24 places cannot be represented in type 'int' > > Fixes: > > 11377/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TIFF_fuzzer-5694319101476864 > > > > Found-by: continuous fuzzing process > > https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg > > > Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> > > --- > > libavcodec/tiff.c | 10 +++++----- > > 1 file changed, 5 insertions(+), 5 deletions(-) > > > > diff --git a/libavcodec/tiff.c b/libavcodec/tiff.c > > index 6271c937c3..64a3261fd9 100644 > > --- a/libavcodec/tiff.c > > +++ b/libavcodec/tiff.c > > @@ -706,7 +706,7 @@ static int init_image(TiffContext *s, ThreadFrame > > *frame) > > s->avctx->pix_fmt = s->palette_is_set ? AV_PIX_FMT_PAL8 : > > AV_PIX_FMT_GRAY8; > > break; > > case 10081: > > - switch (s->pattern[0] | (s->pattern[1] << 8) | (s->pattern[2] << > > 16) | (s->pattern[3] << 24)) { > > + switch (s->pattern[0] | (s->pattern[1] << 8) | (s->pattern[2] << > > 16) | ((unsigned)s->pattern[3] << 24)) { > > case 0x02010100: > > s->avctx->pix_fmt = AV_PIX_FMT_BAYER_RGGB8; > > break; > > @@ -721,7 +721,7 @@ static int init_image(TiffContext *s, ThreadFrame > > *frame) > > break; > > default: > > av_log(s->avctx, AV_LOG_ERROR, "Unsupported Bayer pattern: > > 0x%X\n", > > - s->pattern[0] | s->pattern[1] << 8 | s->pattern[2] << > > 16 | s->pattern[3] << 24); > > + s->pattern[0] | s->pattern[1] << 8 | s->pattern[2] << > > 16 | (unsigned)s->pattern[3] << 24); > > return AVERROR_PATCHWELCOME; > > } > > break; > > @@ -741,12 +741,12 @@ static int init_image(TiffContext *s, ThreadFrame > > *frame) > > break; > > default: > > av_log(s->avctx, AV_LOG_ERROR, "Unsupported Bayer pattern: > > 0x%X\n", > > - s->pattern[0] | s->pattern[1] << 8 | s->pattern[2] << > > 16 | s->pattern[3] << 24); > > + s->pattern[0] | s->pattern[1] << 8 | s->pattern[2] << > > 16 | (unsigned)s->pattern[3] << 24); > > return AVERROR_PATCHWELCOME; > > } > > break; > > case 10161: > > - switch (s->pattern[0] | s->pattern[1] << 8 | s->pattern[2] << 16 | > > s->pattern[3] << 24) { > > + switch (s->pattern[0] | s->pattern[1] << 8 | s->pattern[2] << 16 | > > (unsigned)s->pattern[3] << 24) { > > case 0x02010100: > > s->avctx->pix_fmt = s->le ? AV_PIX_FMT_BAYER_RGGB16LE : > > AV_PIX_FMT_BAYER_RGGB16BE; > > break; > > @@ -761,7 +761,7 @@ static int init_image(TiffContext *s, ThreadFrame > > *frame) > > break; > > default: > > av_log(s->avctx, AV_LOG_ERROR, "Unsupported Bayer pattern: > > 0x%X\n", > > - s->pattern[0] | s->pattern[1] << 8 | s->pattern[2] << > > 16 | s->pattern[3] << 24); > > + s->pattern[0] | s->pattern[1] << 8 | s->pattern[2] << > > 16 | (unsigned)s->pattern[3] << 24); > > return AVERROR_PATCHWELCOME; > > } > > break; > > So fixing undefined behavior mostly? A function might make this nicer > looking, else there's not much to say
yes, indeed, ill post a patch doing that thx [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB Freedom in capitalist society always remains about the same as it was in ancient Greek republics: Freedom for slave owners. -- Vladimir Lenin
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