linux-stable-rt/fs/nfs
Chuck Lever 5b362ac379 NFS: Fix panic after nfs_umount()
After a few unsuccessful NFS mount attempts in which the client and
server cannot agree on an authentication flavor both support, the
client panics.  nfs_umount() is invoked in the kernel in this case.

Turns out nfs_umount()'s UMNT RPC invocation causes the RPC client to
write off the end of the rpc_clnt's iostat array.  This is because the
mount client's nrprocs field is initialized with the count of defined
procedures (two: MNT and UMNT), rather than the size of the client's
proc array (four).

The fix is to use the same initialization technique used by most other
upper layer clients in the kernel.

Introduced by commit 0b524123, which failed to update nrprocs when
support was added for UMNT in the kernel.

BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=24302
BugLink: http://bugs.launchpad.net/bugs/683938

Reported-by: Stefan Bader <stefan.bader@canonical.com>
Tested-by: Stefan Bader <stefan.bader@canonical.com>
Cc: stable@kernel.org # >= 2.6.32
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2010-12-10 13:01:50 -05:00
..
Kconfig
Makefile
cache_lib.c
cache_lib.h
callback.c BKL: remove extraneous #include <smp_lock.h> 2010-11-17 08:59:32 -08:00
callback.h
callback_proc.c
callback_xdr.c
client.c
delegation.c BKL: remove extraneous #include <smp_lock.h> 2010-11-17 08:59:32 -08:00
delegation.h
dir.c NFS: Readdir cleanups 2010-12-07 14:09:02 -05:00
direct.c Pure nfs client performance using odirect. 2010-11-22 13:24:42 -05:00
dns_resolve.c
dns_resolve.h
file.c NFS: Fix fcntl F_GETLK not reporting some conflicts 2010-12-07 19:30:43 -05:00
fscache-index.c
fscache.c
fscache.h
getroot.c
idmap.c
inode.c NFS: Fix a memory leak in nfs_readdir 2010-12-02 09:58:00 -05:00
internal.h NFS: Ensure we return the dirent->d_type when it is known 2010-11-22 13:24:48 -05:00
iostat.h
mount_clnt.c NFS: Fix panic after nfs_umount() 2010-12-10 13:01:50 -05:00
namespace.c
nfs2xdr.c NFS: Ensure we return the dirent->d_type when it is known 2010-11-22 13:24:48 -05:00
nfs3acl.c
nfs3proc.c
nfs3xdr.c NFS: Ensure we return the dirent->d_type when it is known 2010-11-22 13:24:48 -05:00
nfs4_fs.h
nfs4filelayout.c
nfs4filelayout.h
nfs4filelayoutdev.c
nfs4namespace.c
nfs4proc.c nfs: Discard ACL cache on mode update 2010-12-07 19:30:42 -05:00
nfs4renewd.c
nfs4state.c
nfs4xdr.c NFS: Ensure we return the dirent->d_type when it is known 2010-11-22 13:24:48 -05:00
nfsroot.c
pagelist.c nfs: remove extraneous and problematic calls to nfs_clear_request 2010-12-07 23:02:44 -05:00
pnfs.c
pnfs.h
proc.c
read.c nfs: remove extraneous and problematic calls to nfs_clear_request 2010-12-07 23:02:44 -05:00
super.c nfs: kernel should return EPROTONOSUPPORT when not support NFSv4 2010-12-07 19:30:44 -05:00
symlink.c
sysctl.c
unlink.c
write.c nfs: remove extraneous and problematic calls to nfs_clear_request 2010-12-07 23:02:44 -05:00