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dlm: check for null in device_write

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If `device_write' method is called via "dlm-control",
file->private_data is NULL. (See ctl_device_open() in
user.c. ) Through proc->flags is read.

Signed-off-by: Masatake YAMATO <yamato@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
This commit is contained in:
Masatake YAMATO 2008-05-28 14:45:10 +09:00 • committed by David Teigland
parent bce7f793da
commit 254ae43ab8
1 changed files with 1 additions and 1 deletions
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2
fs/dlm/user.c
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@ -538,7 +538,7 @@ static ssize_t device_write(struct file *file, const char __user *buf,
/* do we really need this? can a write happen after a close? */ /* do we really need this? can a write happen after a close? */
if ((kbuf->cmd == DLM_USER_LOCK || kbuf->cmd == DLM_USER_UNLOCK) && if ((kbuf->cmd == DLM_USER_LOCK || kbuf->cmd == DLM_USER_UNLOCK) &&
test_bit(DLM_PROC_FLAGS_CLOSING, &proc->flags)) (proc && test_bit(DLM_PROC_FLAGS_CLOSING, &proc->flags)))
return -EINVAL; return -EINVAL;
sigfillset(&allsigs); sigfillset(&allsigs);