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authorSteve French <sfrench@us.ibm.com>2007-05-23 14:45:36 +0000
committerSteve French <sfrench@us.ibm.com>2007-05-23 14:45:36 +0000
commit28356a1679006b110215596e057f304ef3083922 (patch)
treea0fb257bab98c9fe5057462ee4f9cf84b88100a6 /fs/cifs
parentad9ddd66c6e8a79630a975ff0bb8d45a11abe630 (diff)
downloadblackbird-op-linux-28356a1679006b110215596e057f304ef3083922.tar.gz
blackbird-op-linux-28356a1679006b110215596e057f304ef3083922.zip
[CIFS] Fix oops on failed cifs mount (in kthread_stop)
If the cifs demultiplex thread wakes up and exits (zeroing server->tsk) before kthread_stop is called, the cifs_mount code could pass a null pointer to kthread_stop Thanks to akpm, Dave Young and Shaggy for suggesting earlier versions of this patch. CC: akpm@linux-foundatior.org Signed-off-by: Dave Young <hidave.darkstar@gmail.com> Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
Diffstat (limited to 'fs/cifs')
-rw-r--r--fs/cifs/connect.c14
1 files changed, 12 insertions, 2 deletions
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 216fb625843f..f6963d183c53 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -2069,8 +2069,15 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
srvTcp->tcpStatus = CifsExiting;
spin_unlock(&GlobalMid_Lock);
if (srvTcp->tsk) {
+ struct task_struct *tsk;
+ /* If we could verify that kthread_stop would
+ always wake up processes blocked in
+ tcp in recv_mesg then we could remove the
+ send_sig call */
send_sig(SIGKILL,srvTcp->tsk,1);
- kthread_stop(srvTcp->tsk);
+ tsk = srvTcp->tsk;
+ if(tsk)
+ kthread_stop(srvTcp->tsk);
}
}
/* If find_unc succeeded then rc == 0 so we can not end */
@@ -2085,8 +2092,11 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
/* if the socketUseCount is now zero */
if ((temp_rc == -ESHUTDOWN) &&
(pSesInfo->server) && (pSesInfo->server->tsk)) {
+ struct task_struct *tsk;
send_sig(SIGKILL,pSesInfo->server->tsk,1);
- kthread_stop(pSesInfo->server->tsk);
+ tsk = pSesInfo->server->tsk;
+ if(tsk)
+ kthread_stop(tsk);
}
} else
cFYI(1, ("No session or bad tcon"));
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