tree df0ff2e9ae81331cc20c01be56dc64255e36a3e6
parent 6a76cddecff0c7420c1d6785b77dd1823f36219d
author Changming Liu <charley.ashbringer@gmail.com> 1594441818 -0400
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1599125062 +0200

USB: sisusbvga: Fix a potential UB casued by left shifting a negative value

[ Upstream commit 2b53a19284f537168fb506f2f40d7fda40a01162 ]

The char buffer buf, receives data directly from user space,
so its content might be negative and its elements are left
shifted to form an unsigned integer.

Since left shifting a negative value is undefined behavior, thus
change the char to u8 to elimintate this UB.

Signed-off-by: Changming Liu <charley.ashbringer@gmail.com>
Link: https://lore.kernel.org/r/20200711043018.928-1-charley.ashbringer@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>