[ 014/133] lib/gcd.c: prevent possible div by 0
From: Greg Kroah-Hartman
Date: Wed Oct 10 2012 - 18:53:31 EST
3.5-stable review patch. If anyone has any objections, please let me know.
------------------
From: Davidlohr Bueso <dave@xxxxxxx>
commit e96875677fb2b7cb739c5d7769824dff7260d31d upstream.
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@xxxxxxx>
Cc: Eric Dumazet <eric.dumazet@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
lib/gcd.c | 3 +++
1 file changed, 3 insertions(+)
--- a/lib/gcd.c
+++ b/lib/gcd.c
@@ -9,6 +9,9 @@ unsigned long gcd(unsigned long a, unsig
if (a < b)
swap(a, b);
+
+ if (!b)
+ return a;
while ((r = a % b) != 0) {
a = b;
b = r;
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/