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When less than 3 bytes are written to the device, memcpy is called with negative array size which leads to buffer overflow and kernel panic. This patch adds a condition and returns -EOPNOTSUPP instead. Fixes bugzilla issue 64871 [mchehab+samsung@kernel.org: fix a merge conflict and changed the condition to match the patch's comment, e. g. len == 3 could also be valid] Signed-off-by: Jozef Balga <jozef.balga@gmail.com> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>