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avcodec/jpeg2000dec: error check when processing tlm marker 

Validate the value of ST field in the TLM marker of JPEG2000.
Throw an error when ST takes value of 0b11.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Gautam Ramakrishnan 2020-03-26 10:24:36 +05:30 committed by Michael Niedermayer
parent b71685865f
commit 26a36801c0
1 changed files with 6 additions and 2 deletions
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8
libavcodec/jpeg2000dec.c
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@ -795,7 +795,7 @@ static int get_sot(Jpeg2000DecoderContext *s, int n)
* markers. Parsing the TLM header is needed to increment the input header
* buffer.
* This marker is mandatory for DCI. */
static uint8_t get_tlm(Jpeg2000DecoderContext *s, int n)
static int get_tlm(Jpeg2000DecoderContext *s, int n)
{
uint8_t Stlm, ST, SP, tile_tlm, i;
bytestream2_get_byte(&s->g); /* Ztlm: skipped */
@ -803,7 +803,11 @@ static uint8_t get_tlm(Jpeg2000DecoderContext *s, int n)
// too complex ? ST = ((Stlm >> 4) & 0x01) + ((Stlm >> 4) & 0x02);
ST = (Stlm >> 4) & 0x03;
// TODO: Manage case of ST = 0b11 --> raise error
if (ST == 0x03) {
av_log(s->avctx, AV_LOG_ERROR, "TLM marker contains invalid ST value.\n");
return AVERROR_INVALIDDATA;
}
SP = (Stlm >> 6) & 0x01;
tile_tlm = (n - 4) / ((SP + 1) * 2 + ST);
for (i = 0; i < tile_tlm; i++) {