Added cc: stable and merged to cifs-2.6.git If no objections, seems like a reasonable candidate for 3.8 as it fixes an oops. On Fri, Feb 1, 2013 at 2:11 PM, Jeff Layton <jlayton@xxxxxxxxxx> wrote: > Kjell Braden reported this oops: > > [ 833.211970] BUG: unable to handle kernel NULL pointer dereference at (null) > [ 833.212816] IP: [< (null)>] (null) > [ 833.213280] PGD 1b9b2067 PUD e9f7067 PMD 0 > [ 833.213874] Oops: 0010 [#1] SMP > [ 833.214344] CPU 0 > [ 833.214458] Modules linked in: des_generic md4 nls_utf8 cifs vboxvideo drm snd_intel8x0 snd_ac97_codec ac97_bus snd_pcm snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq bnep rfcomm snd_timer bluetooth snd_seq_device ppdev snd vboxguest parport_pc joydev mac_hid soundcore snd_page_alloc psmouse i2c_piix4 serio_raw lp parport usbhid hid e1000 > [ 833.215629] > [ 833.215629] Pid: 1752, comm: mount.cifs Not tainted 3.0.0-rc7-bisectcifs-fec11dd9a0+ #18 innotek GmbH VirtualBox/VirtualBox > [ 833.215629] RIP: 0010:[<0000000000000000>] [< (null)>] (null) > [ 833.215629] RSP: 0018:ffff8800119c9c50 EFLAGS: 00010282 > [ 833.215629] RAX: ffffffffa02186c0 RBX: ffff88000c427780 RCX: 0000000000000000 > [ 833.215629] RDX: 0000000000000000 RSI: ffff88000c427780 RDI: ffff88000c4362e8 > [ 833.215629] RBP: ffff8800119c9c88 R08: ffff88001fc15e30 R09: 00000000d69515c7 > [ 833.215629] R10: ffffffffa0201972 R11: ffff88000e8f6a28 R12: ffff88000c4362e8 > [ 833.215629] R13: 0000000000000000 R14: 0000000000000000 R15: ffff88001181aaa6 > [ 833.215629] FS: 00007f2986171700(0000) GS:ffff88001fc00000(0000) knlGS:0000000000000000 > [ 833.215629] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b > [ 833.215629] CR2: 0000000000000000 CR3: 000000001b982000 CR4: 00000000000006f0 > [ 833.215629] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > [ 833.215629] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 > [ 833.215629] Process mount.cifs (pid: 1752, threadinfo ffff8800119c8000, task ffff88001c1c16f0) > [ 833.215629] Stack: > [ 833.215629] ffffffff8116a9b5 ffff8800119c9c88 ffffffff81178075 0000000000000286 > [ 833.215629] 0000000000000000 ffff88000c4276c0 ffff8800119c9ce8 ffff8800119c9cc8 > [ 833.215629] ffffffff8116b06e ffff88001bc6fc00 ffff88000c4276c0 ffff88000c4276c0 > [ 833.215629] Call Trace: > [ 833.215629] [<ffffffff8116a9b5>] ? d_alloc_and_lookup+0x45/0x90 > [ 833.215629] [<ffffffff81178075>] ? d_lookup+0x35/0x60 > [ 833.215629] [<ffffffff8116b06e>] __lookup_hash.part.14+0x9e/0xc0 > [ 833.215629] [<ffffffff8116b1d6>] lookup_one_len+0x146/0x1e0 > [ 833.215629] [<ffffffff815e4f7e>] ? _raw_spin_lock+0xe/0x20 > [ 833.215629] [<ffffffffa01eef0d>] cifs_do_mount+0x26d/0x500 [cifs] > [ 833.215629] [<ffffffff81163bd3>] mount_fs+0x43/0x1b0 > [ 833.215629] [<ffffffff8117d41a>] vfs_kern_mount+0x6a/0xd0 > [ 833.215629] [<ffffffff8117e584>] do_kern_mount+0x54/0x110 > [ 833.215629] [<ffffffff8117fdc2>] do_mount+0x262/0x840 > [ 833.215629] [<ffffffff81108a0e>] ? __get_free_pages+0xe/0x50 > [ 833.215629] [<ffffffff8117f9ca>] ? copy_mount_options+0x3a/0x180 > [ 833.215629] [<ffffffff8118075d>] sys_mount+0x8d/0xe0 > [ 833.215629] [<ffffffff815ece82>] system_call_fastpath+0x16/0x1b > [ 833.215629] Code: Bad RIP value. > [ 833.215629] RIP [< (null)>] (null) > [ 833.215629] RSP <ffff8800119c9c50> > [ 833.215629] CR2: 0000000000000000 > [ 833.238525] ---[ end trace ec00758b8d44f529 ]--- > > When walking down the path on the server, it's possible to hit a > symlink. The path walking code assumes that the caller will handle that > situation properly, but cifs_get_root() isn't set up for it. This patch > prevents the oops by simply returning an error. > > A better solution would be to try and chase the symlinks here, but that's > fairly complicated to handle. > > Fixes: > > https://bugzilla.kernel.org/show_bug.cgi?id=53221 > > Reported-and-Tested-by: Kjell Braden <afflux@xxxxxxxxxxxx> > Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx> > --- > fs/cifs/cifsfs.c | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c > index de7f916..e328339 100644 > --- a/fs/cifs/cifsfs.c > +++ b/fs/cifs/cifsfs.c > @@ -558,6 +558,11 @@ cifs_get_root(struct smb_vol *vol, struct super_block *sb) > dentry = ERR_PTR(-ENOENT); > break; > } > + if (!S_ISDIR(dir->i_mode)) { > + dput(dentry); > + dentry = ERR_PTR(-ENOTDIR); > + break; > + } > > /* skip separators */ > while (*s == sep) > -- > 1.7.11.7 > -- Thanks, Steve -- To unsubscribe from this list: send the line "unsubscribe linux-cifs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
