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Code Issues Releases Activity

g2meet: validate bpp and bitmasks in the display info

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Signed-off-by: Kostya Shishkov <kostya.shishkov@gmail.com>
This commit is contained in:
Maxim Poliakovski 2014-02-15 21:09:22 +01:00 committed by Kostya Shishkov
parent f58dcfb32e
commit 77fbc03265
1 changed files with 21 additions and 1 deletions
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22
libavcodec/g2meet.c
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@ -653,7 +653,7 @@ static int g2m_decode_frame(AVCodecContext *avctx, void *data,
GetByteContext bc, tbc;
int magic;
int got_header = 0;
uint32_t chunk_size;
uint32_t chunk_size, r_mask, g_mask, b_mask;
int chunk_type, chunk_start;
int i;
int ret;
@ -728,6 +728,26 @@ static int g2m_decode_frame(AVCodecContext *avctx, void *data,
c->tiles_x = (c->width + c->tile_width - 1) / c->tile_width;
c->tiles_y = (c->height + c->tile_height - 1) / c->tile_height;
c->bpp = bytestream2_get_byte(&bc);
if (c->bpp == 32) {
if (bytestream2_get_bytes_left(&bc) < 16 ||
(chunk_size - 21) < 16 ) {
av_log(avctx, AV_LOG_ERROR,
"Display info: missing bitmasks!\n");
return AVERROR_INVALIDDATA;
}
r_mask = bytestream2_get_be32(&bc);
g_mask = bytestream2_get_be32(&bc);
b_mask = bytestream2_get_be32(&bc);
if (r_mask != 0xFF0000 || g_mask != 0xFF00 || b_mask != 0xFF) {
av_log(avctx, AV_LOG_ERROR,
"Invalid or unsupported bitmasks: R=%X, G=%X, B=%X\n",
r_mask, g_mask, b_mask);
return AVERROR_PATCHWELCOME;
}
} else {
avpriv_request_sample(avctx, "bpp=%d", c->bpp);
return AVERROR_PATCHWELCOME;
}
if (g2m_init_buffers(c)) {
ret = AVERROR(ENOMEM);
goto header_fail;