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KVM: x86: fix shift out of bounds reported by UBSAN
authorPaolo Bonzini <pbonzini@redhat.com>
Tue, 22 Dec 2020 10:20:43 +0000 (05:20 -0500)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Tue, 12 Jan 2021 19:16:25 +0000 (20:16 +0100)
commit7795afa0d7a907df392483efe9a38b4f875169f7
tree62d00137114017104e441aa1ad537a62988a8fectree
parenta9d49da7edf85b947cf33e2b4217b092aee6a43bcommit | diff
KVM: x86: fix shift out of bounds reported by UBSAN

commit 2f80d502d627f30257ba7e3655e71c373b7d1a5a upstream.

Since we know that e >= s, we can reassociate the left shift,
changing the shifted number from 1 to 2 in exchange for
decreasing the right hand side by 1.

Reported-by: syzbot+e87846c48bf72bc85311@syzkaller.appspotmail.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
arch/x86/kvm/mmu.h diff | blob | blame | history
Mirror https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git