| From | Greg Kroah-Hartman <> | Subject | [ 19/71] jffs2: hold erase_completion_lock on exit | Date | Tue, 15 Jan 2013 14:54:16 -0800 |
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3.0-stable review patch. If anyone has any objections, please let me know.
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From: Alexey Khoroshilov <khoroshilov@ispras.ru>
commit 2cbba75a56ea78e6876b4e2547a882f10b3fe72b upstream.
Users of jffs2_do_reserve_space() expect they still held erase_completion_lock after call to it. But there is a path where jffs2_do_reserve_space() leaves erase_completion_lock unlocked. The patch fixes it.
Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- fs/jffs2/nodemgmt.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
--- a/fs/jffs2/nodemgmt.c +++ b/fs/jffs2/nodemgmt.c @@ -355,14 +355,16 @@ static int jffs2_do_reserve_space(struct spin_unlock(&c->erase_completion_lock); ret = jffs2_prealloc_raw_node_refs(c, jeb, 1); - if (ret) - return ret; + /* Just lock it again and continue. Nothing much can change because we hold c->alloc_sem anyway. In fact, it's not entirely clear why we hold c->erase_completion_lock in the majority of this function... but that's a question for another (more caffeine-rich) day. */ spin_lock(&c->erase_completion_lock); + if (ret) + return ret; + waste = jeb->free_size; jffs2_link_node_ref(c, jeb, (jeb->offset + c->sector_size - waste) | REF_OBSOLETE,
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