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lib/lcm.c: ensure correct result whenever it fits

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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>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rasmus Villemoes 2014-12-10 15:51:27 -08:00 • committed by Linus Torvalds
parent 7b212edf86
commit 74a5fef7cb
1 changed files with 1 additions and 1 deletions
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2
lib/lcm.c
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@ -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;