Fixes out of array access
Fixes: asan_heap-oob_20a6c26_2690_cov_3434532168_mail.png
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
{
if (length != 13)
return AVERROR_INVALIDDATA;
+
+ if (s->state & PNG_IDAT) {
+ av_log(avctx, AV_LOG_ERROR, "IHDR after IDAT\n");
+ return AVERROR_INVALIDDATA;
+ }
+
s->width = bytestream2_get_be32(&s->gb);
s->height = bytestream2_get_be32(&s->gb);
if (av_image_check_size(s->width, s->height, 0, avctx)) {