From d9282cb66353be502aae09aae75d05a6863eb979 Mon Sep 17 00:00:00 2001
From: Pan Xinhui <xinhuix.pan@intel.com>
Date: Wed, 9 Sep 2015 15:37:05 -0700
Subject: [PATCH] lib/bitmap.c: fix a special string handling bug in
__bitmap_parselist
If string end with '-', for exapmle, bitmap_parselist("1,0-",&mask,
nmaskbits), It is not in a valid pattern, so add a check after loop.
Return -EINVAL on such condition.
Signed-off-by: Pan Xinhui <xinhuix.pan@intel.com>
Cc: Yury Norov <yury.norov@gmail.com>
Cc: Chris Metcalf <cmetcalf@ezchip.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Sudeep Holla <sudeep.holla@arm.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 eb21456be4b9e..f549176e92502 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -546,6 +546,7 @@ static int __bitmap_parselist(const char *buf, unsigned int buflen,
return -EINVAL;
b = 0;
in_range = 1;
+ at_start = 1;
continue;
}
@@ -558,6 +559,9 @@ static int __bitmap_parselist(const char *buf, unsigned int buflen,
at_start = 0;
totaldigits++;
}
+ /* if no digit is after '-', it's wrong*/
+ if (at_start && in_range)
+ return -EINVAL;
if (!(a <= b))
return -EINVAL;
if (b >= nmaskbits)
--
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