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>
This commit is contained in:
Родитель
3c522cedb5
Коммит
8074b26f67
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@ -1940,7 +1940,7 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
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error = -EINVAL;
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if (S_ISBLK(inode->i_mode)) {
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bdev = I_BDEV(inode);
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bdev = bdgrab(I_BDEV(inode));
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error = blkdev_get(bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL,
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sys_swapon);
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if (error < 0) {
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