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| author | Alexey Khoroshilov <khoroshilov@ispras.ru> | 2012-11-05 22:40:14 +0400 |
|---|---|---|
| committer | Artem Bityutskiy <artem.bityutskiy@linux.intel.com> | 2012-11-18 11:59:01 +0200 |
| commit | 2cbba75a56ea78e6876b4e2547a882f10b3fe72b (patch) | |
| tree | 5a3789fbc954d829605e0bd3d5fa49bedcfcbbc9 | |
| parent | d68cbdd4fb04d2b756ad53c22f36943167b16340 (diff) | |
| download | linux-stable-2cbba75a56ea78e6876b4e2547a882f10b3fe72b.tar.gz linux-stable-2cbba75a56ea78e6876b4e2547a882f10b3fe72b.tar.bz2 linux-stable-2cbba75a56ea78e6876b4e2547a882f10b3fe72b.zip | |
jffs2: hold erase_completion_lock on exit
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>
Cc: stable@vger.kernel.org
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
| -rw-r--r-- | fs/jffs2/nodemgmt.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/fs/jffs2/nodemgmt.c b/fs/jffs2/nodemgmt.c index 0c96eb52c797..03310721712f 100644 --- a/fs/jffs2/nodemgmt.c +++ b/fs/jffs2/nodemgmt.c @@ -417,14 +417,16 @@ static int jffs2_do_reserve_space(struct jffs2_sb_info *c, uint32_t minsize, 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, |