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authorAndi Kleen <ak@suse.de>2007-11-05 14:50:56 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-11-05 15:12:32 -0800
commit0b030c2c2f0f1d98d5fe412e5b7cf7fd53f5221a (patch)
treeff10db5bc25c1aa3e7cc5c8dac6807d76fd7f506 /lib/bitmap.c
parent5a75983eef1193c43caebde6643a218bd8d8390e (diff)
Fix bitmap_scnlistprintf for empty masks
When a bitmap is empty bitmap_scnlistprintf() would leave the buffer uninitialized. Set it to an empty string in this case. I didn't see any in normal kernel callers hitting this, but some custom debug code of mine did. Signed-off-by: Andi Kleen <ak@suse.de> Acked-by: Paul Jackson <pj@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/bitmap.c')
-rw-r--r--lib/bitmap.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/bitmap.c b/lib/bitmap.c
index 26ebafa8c41d..2c9242e3fed0 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -469,6 +469,10 @@ int bitmap_scnlistprintf(char *buf, unsigned int buflen,
/* current bit is 'cur', most recently seen range is [rbot, rtop] */
int cur, rbot, rtop;
+ if (buflen == 0)
+ return 0;
+ buf[0] = 0;
+
rbot = cur = find_first_bit(maskp, nmaskbits);
while (cur < nmaskbits) {
rtop = cur;

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