diff options
| author | dan <dan@FreeBSD.org> | 1999-11-29 19:23:35 +0000 |
|---|---|---|
| committer | dan <dan@FreeBSD.org> | 1999-11-29 19:23:35 +0000 |
| commit | 2caf8b3c1a4dea929715ebd5a7fb4746b9058134 (patch) | |
| tree | e4a75a4f0240e2af9d6cbe8dd0c8be874e7c7fff /sys/libkern | |
| parent | f7d7085dbeec7f40c137f190df9dc78b149e8700 (diff) | |
| download | FreeBSD-src-2caf8b3c1a4dea929715ebd5a7fb4746b9058134.zip FreeBSD-src-2caf8b3c1a4dea929715ebd5a7fb4746b9058134.tar.gz | |
In the extremely miniscule chance that read_random returns <= 0, don't try
and use that return code as a modulus (panics are bad, mmmkay?)
Diffstat (limited to 'sys/libkern')
| -rw-r--r-- | sys/libkern/arc4random.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/sys/libkern/arc4random.c b/sys/libkern/arc4random.c index b6d9070..4eefb69 100644 --- a/sys/libkern/arc4random.c +++ b/sys/libkern/arc4random.c @@ -41,8 +41,12 @@ arc4_randomstir (void) int r, n; r = read_random(key, sizeof(key)); - for (n = r; n < sizeof(key); n++) - key[n] = key[n % r]; + /* if r == 0 || -1, just use what was on the stack */ + if (r > 0) + { + for (n = r; n < sizeof(key); n++) + key[n] = key[n % r]; + } for (n = 0; n < 256; n++) { |
