| From | Greg Kroah-Hartman <> | Subject | [ 06/84] lib/gcd.c: prevent possible div by 0 | Date | Thu, 11 Oct 2012 11:02:50 +0900 |
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3.0-stable review patch. If anyone has any objections, please let me know.
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From: Davidlohr Bueso <dave@gnu.org>
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@gnu.org> Cc: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- 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;
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