This is a note to let you know that I've just added the patch titled
x86/xen: Remove undefined behavior in setup_features()
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
x86-xen-remove-undefined-behavior-in-setup_features.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 2d161481def0d608648b7f5bc2167ef75ef567e9
Author: Julien Grall <jgrall@xxxxxxxxxx>
Date: Fri Jun 17 11:30:37 2022 +0100
x86/xen: Remove undefined behavior in setup_features()
[ Upstream commit ecb6237fa397b7b810d798ad19322eca466dbab1 ]
1 << 31 is undefined. So switch to 1U << 31.
Fixes: 5ead97c84fa7 ("xen: Core Xen implementation")
Signed-off-by: Julien Grall <jgrall@xxxxxxxxxx>
Reviewed-by: Juergen Gross <jgross@xxxxxxxx>
Link: https://lore.kernel.org/r/20220617103037.57828-1-julien@xxxxxxx
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/xen/features.c b/drivers/xen/features.c
index 7b591443833c..87f1828d40d5 100644
--- a/drivers/xen/features.c
+++ b/drivers/xen/features.c
@@ -42,7 +42,7 @@ void xen_setup_features(void)
if (HYPERVISOR_xen_version(XENVER_get_features, &fi) < 0)
break;
for (j = 0; j < 32; j++)
- xen_features[i * 32 + j] = !!(fi.submap & 1<<j);
+ xen_features[i * 32 + j] = !!(fi.submap & 1U << j);
}
if (xen_pv_domain()) {
