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| author | Miklos Szeredi <mszeredi@suse.cz> | 2011-02-24 15:49:53 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-02-24 08:55:01 -0800 |
| commit | 8074b26f67165bf045d92e778c9c10dc5e207fc6 (patch) | |
| tree | 7f4870224b54121fbfea83cd77ea41f7ab3a00d8 /mm | |
| parent | 3c522cedb572bb8d2e4867f358bdaa7d0c53d88c (diff) | |
| download | kernel-common-8074b26f67165bf045d92e778c9c10dc5e207fc6.tar.gz kernel-common-8074b26f67165bf045d92e778c9c10dc5e207fc6.tar.bz2 kernel-common-8074b26f67165bf045d92e778c9c10dc5e207fc6.zip | |
mm: fix refcounting in swapon
Grab a reference to bdev before calling blkdev_get(), which expects
the refcount to be already incremented and either returns success or
decrements the refcount and returns an error.
The bug was introduced by e525fd89 (block: make blkdev_get/put()
handle exclusive access), which didn't take into account this behavior
of blkdev_get().
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/swapfile.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c index 07a458d72fa8..0341c5700e34 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -1940,7 +1940,7 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags) error = -EINVAL; if (S_ISBLK(inode->i_mode)) { - bdev = I_BDEV(inode); + bdev = bdgrab(I_BDEV(inode)); error = blkdev_get(bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL, sys_swapon); if (error < 0) { |