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| author | Miklos Szeredi <mszeredi@suse.cz> | 2011-02-24 15:45:41 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-02-24 08:54:21 -0800 |
| commit | 3c522cedb572bb8d2e4867f358bdaa7d0c53d88c (patch) | |
| tree | b348cabd2574638702f9abcccd0b8b711b136162 /mm | |
| parent | dcace5ac85c628af21878a1fa151e5e6403fb8eb (diff) | |
| download | talos-op-linux-3c522cedb572bb8d2e4867f358bdaa7d0c53d88c.tar.gz talos-op-linux-3c522cedb572bb8d2e4867f358bdaa7d0c53d88c.zip | |
block: fix refcounting in BLKBSZSET
Adam Kovari and others reported that disconnecting an USB drive with
an ntfs-3g filesystem would cause "kernel BUG at fs/inode.c:1421!" to
be triggered.
The BUG could be traced back to ioctl(BLKBSZSET), which would
erroneously decrement the refcount on the bdev. This is because
blkdev_get() 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().
This fixes
https://bugzilla.kernel.org/show_bug.cgi?id=29202
(and likely 29792 too)
Reported-by: Adam Kovari <kovariadam@gmail.com>
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')
0 files changed, 0 insertions, 0 deletions
