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tiffdec: use checked reads for tget*() 

Fixes out of array reads

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-11-09 12:03:57 +01:00
parent 1b5a6d3c49
commit ce1ebb31a9
1 changed files with 4 additions and 4 deletions
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8
libavcodec/tiff.c
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@ -67,26 +67,26 @@ typedef struct TiffContext {
static unsigned tget_short(GetByteContext *gb, int le)
{
unsigned v = le ? bytestream2_get_le16u(gb) : bytestream2_get_be16u(gb);
unsigned v = le ? bytestream2_get_le16(gb) : bytestream2_get_be16(gb);
return v;
}
static unsigned tget_long(GetByteContext *gb, int le)
{
unsigned v = le ? bytestream2_get_le32u(gb) : bytestream2_get_be32u(gb);
unsigned v = le ? bytestream2_get_le32(gb) : bytestream2_get_be32(gb);
return v;
}
static double tget_double(GetByteContext *gb, int le)
{
av_alias64 i = { .u64 = le ? bytestream2_get_le64u(gb) : bytestream2_get_be64u(gb)};
av_alias64 i = { .u64 = le ? bytestream2_get_le64(gb) : bytestream2_get_be64(gb)};
return i.f64;
}
static unsigned tget(GetByteContext *gb, int type, int le)
{
switch (type) {
case TIFF_BYTE : return bytestream2_get_byteu(gb);
case TIFF_BYTE : return bytestream2_get_byte(gb);
case TIFF_SHORT: return tget_short(gb, le);
case TIFF_LONG : return tget_long(gb, le);
default : return UINT_MAX;