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lib/gcd.c: prevent possible div by 0

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Account for all properties when a and/or b are 0:
gcd(0, 0) = 0
gcd(a, 0) = a
gcd(0, b) = b

Fixes no known problems in current kernels.

Signed-off-by: Davidlohr Bueso <dave@gnu.org>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Davidlohr Bueso 2012-10-04 17:13:18 -07:00 committed by Linus Torvalds
parent 8f1f66ed7e
commit e96875677f
1 changed files with 3 additions and 0 deletions
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lib/gcd.c
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@ -9,6 +9,9 @@ unsigned long gcd(unsigned long a, unsigned long b)
if (a < b) if (a < b)
swap(a, b); swap(a, b);
if (!b)
return a;
while ((r = a % b) != 0) { while ((r = a % b) != 0) {
a = b; a = b;
b = r; b = r;