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media: rc: validate that "rc_proto" is reasonable

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Smatch complains that "rc_proto" comes from the user and it can result
in shift wrapping in ir_raw_encode_scancode()

    drivers/media/rc/rc-ir-raw.c:526 ir_raw_encode_scancode()
    error: undefined (user controlled) shift '1 << protocol'

This is true, but I reviewed the surrounding code and it appears
harmless. Anyway, let's verify that "rc_proto" is valid as a kernel
hardening measure.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Dan Carpenter 2020-10-30 12:52:30 +01:00 • committed by Mauro Carvalho Chehab
parent 7399139be6
commit 72e637fec5
2 changed files with 3 additions and 1 deletions
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1
include/uapi/linux/lirc.h
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@ -226,6 +226,7 @@ enum rc_proto {
RC_PROTO_RCMM24 = 25,
RC_PROTO_RCMM32 = 26,
RC_PROTO_XBOX_DVD = 27,
RC_PROTO_MAX = RC_PROTO_XBOX_DVD,
};
#endif