From 0b030c2c2f0f1d98d5fe412e5b7cf7fd53f5221a Mon Sep 17 00:00:00 2001
From: Andi Kleen <ak@suse.de>
Date: Mon, 5 Nov 2007 14:50:56 -0800
Subject: [PATCH] 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>
---
lib/bitmap.c | 4 ++++
1 file changed, 4 insertions(+)
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;