[LTP] [PATCH 3/5] KVM: Fix infinite loop in ptr2hex()

[Martin Doucha]

Contrary to the C standard, (x >> 64) is equivalent to (x >> 0) on x86.
This can cause infinite loop in ptr2hex() if the highest nibble
in the second argument is non-zero. Use temporary variable to avoid
bit-shifting by large values.

Signed-off-by: Martin Doucha <mdoucha@suse.cz>
---
 testcases/kernel/kvm/lib_guest.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/testcases/kernel/kvm/lib_guest.c b/testcases/kernel/kvm/lib_guest.c
index d237293fc..d3b2ac3d5 100644
--- a/testcases/kernel/kvm/lib_guest.c
+++ b/testcases/kernel/kvm/lib_guest.c
@@ -82,7 +82,7 @@ char *ptr2hex(char *dest, uintptr_t val)
 	uintptr_t tmp;
 	char *ret = dest;
 
-	for (i = 4; val >> i; i += 4)
+	for (i = 4, tmp = val >> 4; tmp; i += 4, tmp >>= 4)
 		;
 
 	do {
-- 
2.40.0