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| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2014-12-29 15:00:19 +0200 |
|---|---|---|
| committer | Eric Van Hensbergen <ericvh@gmail.com> | 2015-03-20 07:34:41 -0700 |
| commit | b642f7269bd40ae9abe9cff01581b2eb5e2c2287 (patch) | |
| tree | 40f638e64883cb5224c1c2c0a6a3c34579c9f737 /fs/9p/vfs_file.c | |
| parent | ad80492df56b4bd2d4da9990678d87b66af42f54 (diff) | |
| download | lwn-b642f7269bd40ae9abe9cff01581b2eb5e2c2287.tar.gz lwn-b642f7269bd40ae9abe9cff01581b2eb5e2c2287.zip | |
9p: do not crash on unknown lock status code
Current 9p implementation will crash whole system if sees unknown lock
status code. It's trivial target for DOS: 9p server can produce such
code easily.
Let's fallback more gracefully: warning in dmesg + -ENOLCK.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Diffstat (limited to 'fs/9p/vfs_file.c')
| -rw-r--r-- | fs/9p/vfs_file.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c index 8d29e1e03dfa..9612e5fc0ae2 100644 --- a/fs/9p/vfs_file.c +++ b/fs/9p/vfs_file.c @@ -212,12 +212,13 @@ static int v9fs_file_do_lock(struct file *filp, int cmd, struct file_lock *fl) case P9_LOCK_BLOCKED: res = -EAGAIN; break; + default: + WARN_ONCE(1, "unknown lock status code: %d\n", status); + /* fallthough */ case P9_LOCK_ERROR: case P9_LOCK_GRACE: res = -ENOLCK; break; - default: - BUG(); } out_unlock: |