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avcodec/exr: More strictly check dc_count Fixes: out of array access Fixes: exr/deneme Found-by: Burak Çarıkçı <burakcarikci@crypttech.com> (From OE-Core rev: e03fda4df5d2865d5ac516f45aa120e2caf7de47) Signed-off-by: Michael Niedermayer <michael@niedermayer.cc> CVE: CVE-2021-33815 Upstream-Status: Backport [26d3c81bc5ef2f8c3f09d45eaeacfb4b1139a777] Signed-off-by: Tony Tascioglu <tony.tascioglu@windriver.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>