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authorDavid Howells <dhowells@redhat.com>2020-04-28 21:27:48 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2020-04-28 14:37:40 -0700
commitdd7bc8158b413e0b580c491e8bd18cb91057c7c2 (patch)
treec50f4a1e9fc7769c7f5c6b7bf0d4b1ab7085bf18 /net/can
parentedb98d162418e90d6d2c1cec42e09be0375cfd88 (diff)
Fix use after free in get_tree_bdev()
Commit 6fcf0c72e4b9, a fix to get_tree_bdev() put a missing blkdev_put() in the wrong place, before a warnf() that displays the bdev under consideration rather after it. This results in a silent lockup in printk("%pg") called via warnf() from get_tree_bdev() under some circumstances when there's a race with the blockdev being frozen. This can be caused by xfstests/tests/generic/085 in combination with Lukas Czerner's ext4 mount API conversion patchset. It looks like it ought to occur with other users of get_tree_bdev() such as XFS, but apparently doesn't. Fix this by switching the order of the lines. Fixes: 6fcf0c72e4b9 ("vfs: add missing blkdev_put() in get_tree_bdev()") Reported-by: Lukas Czerner <lczerner@redhat.com> Signed-off-by: David Howells <dhowells@redhat.com> cc: Ian Kent <raven@themaw.net> cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'net/can')
0 files changed, 0 insertions, 0 deletions