[PATCH 1/2] lib/lcm.c: Ensure correct result whenever it fits

[Rasmus Villemoes <linux@rasmusvillemoes.dk>]

Ensure that lcm(a,b) returns the mathematically correct result,
provided it fits in an unsigned long. The current version returns
garbage if a*b overflows, even if the final result would fit.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
---
There are of course still plenty of cases where the return value is
wrong.

 lib/lcm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/lcm.c b/lib/lcm.c
index b9c8de4..01b3aa9 100644
--- a/lib/lcm.c
+++ b/lib/lcm.c
@@ -7,7 +7,7 @@
 unsigned long lcm(unsigned long a, unsigned long b)
 {
 	if (a && b)
-		return (a * b) / gcd(a, b);
+		return (a / gcd(a, b)) * b;
 	else if (b)
 		return b;
 
-- 
1.8.4.rc3.2.g61bff3f