diff options
| author | Jeff Layton <jlayton@redhat.com> | 2009-12-03 08:09:41 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-01-06 14:26:20 -0800 |
| commit | c7d622e356d6a21b788bd34cef607e01ae28c197 (patch) | |
| tree | b5f7441bfda31ddb1406ad1451fab1f11f18e024 | |
| parent | 637cd43cefe67a93f58a5147762ad66a556d0483 (diff) | |
cifs: NULL out tcon, pSesInfo, and srvTcp pointers when chasing DFS referrals
commit a2934c7b363ddcc001964f2444649f909e583bef upstream.
The scenario is this:
The kernel gets EREMOTE and starts chasing a DFS referral at mount time.
The tcon reference is put, which puts the session reference too, but
neither pointer is zeroed out.
The mount gets retried (goto try_mount_again) with new mount info.
Session setup fails fails and rc ends up being non-zero. The code then
falls through to the end and tries to put the previously freed tcon
pointer again. Oops at: cifs_put_smb_ses+0x14/0xd0
Fix this by moving the initialization of the rc variable and the tcon,
pSesInfo and srvTcp pointers below the try_mount_again label. Also, add
a FreeXid() before the goto to prevent xid "leaks".
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Reported-by: Gustavo Carvalho Homem <gustavo@angulosolido.pt>
Signed-off-by: Steve French <sfrench@us.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | fs/cifs/connect.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index 5c084e517d6..08a44ca2a8d 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -2267,12 +2267,12 @@ int cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb, char *mount_data_global, const char *devname) { - int rc = 0; + int rc; int xid; struct smb_vol *volume_info; - struct cifsSesInfo *pSesInfo = NULL; - struct cifsTconInfo *tcon = NULL; - struct TCP_Server_Info *srvTcp = NULL; + struct cifsSesInfo *pSesInfo; + struct cifsTconInfo *tcon; + struct TCP_Server_Info *srvTcp; char *full_path; char *mount_data = mount_data_global; #ifdef CONFIG_CIFS_DFS_UPCALL @@ -2281,6 +2281,10 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb, int referral_walks_count = 0; try_mount_again: #endif + rc = 0; + tcon = NULL; + pSesInfo = NULL; + srvTcp = NULL; full_path = NULL; xid = GetXid(); @@ -2577,6 +2581,7 @@ remote_path_check: cleanup_volume_info(&volume_info); referral_walks_count++; + FreeXid(xid); goto try_mount_again; } #else /* No DFS support, return error on mount */ |