diff options
| author | Davidlohr Bueso <dave@gnu.org> | 2012-10-05 02:13:18 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-10-05 20:04:57 +0200 |
| commit | e96875677fb2b7cb739c5d7769824dff7260d31d (patch) | |
| tree | 4d33caeb4dc7584832945427ed8890b3e5c856db /lib/gcd.c | |
| parent | lib/Kconfig.debug: adjust hard-lockup related Kconfig options (diff) | |
| download | linux-e96875677fb2b7cb739c5d7769824dff7260d31d.tar.xz linux-e96875677fb2b7cb739c5d7769824dff7260d31d.zip | |
lib/gcd.c: prevent possible div by 0
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>
Diffstat (limited to 'lib/gcd.c')
| -rw-r--r-- | lib/gcd.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/gcd.c b/lib/gcd.c index cce4f3cd14b3..3657f129d7b8 100644 --- a/lib/gcd.c +++ b/lib/gcd.c @@ -9,6 +9,9 @@ unsigned long gcd(unsigned long a, unsigned long b) if (a < b) swap(a, b); + + if (!b) + return a; while ((r = a % b) != 0) { a = b; b = r; |