linux-kernel - [PATCH] lib/bitmap.c: add some check to correct the parse result

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Message-ID: <558E4462.7060600@intel.com>
Date:	Sat, 27 Jun 2015 14:36:18 +0800
From:	Pan Xinhui <xinhuix.pan@...el.com>
To:	linux-kernel@...r.kernel.org
CC:	akpm@...ux-foundation.org, linux@...musvillemoes.dk, tj@...nel.org,
	mnipxh@....com
Subject: [PATCH] lib/bitmap.c: add some check to correct the parse result

Sometimes the input from user may cause an unexpected result.

for example, echo "1-3," > /proc/irq/<xxx>/smp_affinity_list.
The correct result should be 1-3, however we got 0-4.

To avoid this issue, we check if there is a ready digit.
If no valid digit is set, we just continue to the next parse.

Signed-off-by: Pan Xinhui <xinhuix.pan@...el.com>
---
  lib/bitmap.c | 2 ++
  1 file changed, 2 insertions(+)

diff --git a/lib/bitmap.c b/lib/bitmap.c
index 64c0926..3c489c1 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -561,6 +561,8 @@ static int __bitmap_parselist(const char *buf, unsigned int buflen,
  			return -EINVAL;
  		if (b >= nmaskbits)
  			return -ERANGE;
+		if (unlikely(exp_digit))
+			continue;
  		while (a <= b) {
  			set_bit(a, maskp);
  			a++;
-- 
1.9.1
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