Commit 0b030c2c authored by Andi Kleen's avatar Andi Kleen Committed by Linus Torvalds

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: default avatarAndi Kleen <ak@suse.de>
Acked-by: default avatarPaul Jackson <pj@sgi.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 5a75983e
......@@ -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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