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authorRabin Vincent <rabin.vincent@axis.com>2015-12-23 07:32:41 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-02-25 12:01:17 -0800
commit5d80673404e691093d66fc5b02c8bc2ac1692d77 (patch)
tree93a34c15bfd149574bbe5756675a9d2c9e455362 /fs/cifs/connect.c
parent88413fceab844abec9e8007aaeec35c4bfc3f3fc (diff)
cifs: fix race between call_async() and reconnect()
commit 820962dc700598ffe8cd21b967e30e7520c34748 upstream. cifs_call_async() queues the MID to the pending list and calls smb_send_rqst(). If smb_send_rqst() performs a partial send, it sets the tcpStatus to CifsNeedReconnect and returns an error code to cifs_call_async(). In this case, cifs_call_async() removes the MID from the list and returns to the caller. However, cifs_call_async() releases the server mutex _before_ removing the MID. This means that a cifs_reconnect() can race with this function and manage to remove the MID from the list and delete the entry before cifs_call_async() calls cifs_delete_mid(). This leads to various crashes due to the use after free in cifs_delete_mid(). Task1 Task2 cifs_call_async(): - rc = -EAGAIN - mutex_unlock(srv_mutex) cifs_reconnect(): - mutex_lock(srv_mutex) - mutex_unlock(srv_mutex) - list_delete(mid) - mid->callback() cifs_writev_callback(): - mutex_lock(srv_mutex) - delete(mid) - mutex_unlock(srv_mutex) - cifs_delete_mid(mid) <---- use after free Fix this by removing the MID in cifs_call_async() before releasing the srv_mutex. Also hold the srv_mutex in cifs_reconnect() until the MIDs are moved out of the pending list. Signed-off-by: Rabin Vincent <rabin.vincent@axis.com> Acked-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com> Signed-off-by: Steve French <sfrench@localhost.localdomain> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/cifs/connect.c')
-rw-r--r--fs/cifs/connect.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index ecb0803bdb0e..3c194ff0d2f0 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -368,7 +368,6 @@ cifs_reconnect(struct TCP_Server_Info *server)
server->session_key.response = NULL;
server->session_key.len = 0;
server->lstrp = jiffies;
- mutex_unlock(&server->srv_mutex);
/* mark submitted MIDs for retry and issue callback */
INIT_LIST_HEAD(&retry_list);
@@ -381,6 +380,7 @@ cifs_reconnect(struct TCP_Server_Info *server)
list_move(&mid_entry->qhead, &retry_list);
}
spin_unlock(&GlobalMid_Lock);
+ mutex_unlock(&server->srv_mutex);
cifs_dbg(FYI, "%s: issuing mid callbacks\n", __func__);
list_for_each_safe(tmp, tmp2, &retry_list) {