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| author | Al Viro <viro@zeniv.linux.org.uk> | 2012-08-29 15:00:01 +0200 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2012-09-23 02:48:20 +0200 |
| commit | c5aa1e554a20fb3542c62688ae46049c9225a965 (patch) | |
| tree | 8dd6c11b16f9615bced5b43f3918f3e992466b80 /fs | |
| parent | do_add_mount()/umount -l races (diff) | |
| download | linux-c5aa1e554a20fb3542c62688ae46049c9225a965.tar.xz linux-c5aa1e554a20fb3542c62688ae46049c9225a965.zip | |
close the race in nlmsvc_free_block()
we need to grab mutex before the reference counter reaches 0
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/lockd/svclock.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/fs/lockd/svclock.c b/fs/lockd/svclock.c index fb1a2bedbe97..8d80c990dffd 100644 --- a/fs/lockd/svclock.c +++ b/fs/lockd/svclock.c @@ -289,7 +289,6 @@ static void nlmsvc_free_block(struct kref *kref) dprintk("lockd: freeing block %p...\n", block); /* Remove block from file's list of blocks */ - mutex_lock(&file->f_mutex); list_del_init(&block->b_flist); mutex_unlock(&file->f_mutex); @@ -303,7 +302,7 @@ static void nlmsvc_free_block(struct kref *kref) static void nlmsvc_release_block(struct nlm_block *block) { if (block != NULL) - kref_put(&block->b_count, nlmsvc_free_block); + kref_put_mutex(&block->b_count, nlmsvc_free_block, &block->b_file->f_mutex); } /* |