Ryusuke Konishi d7178c79d9 nilfs2: fix NULL pointer dereference in nilfs_load_super_block() ... According to the report from Slicky Devil, nilfs caused kernel oops at nilfs_load_super_block function during mount after he shrank the partition without resizing the filesystem: BUG: unable to handle kernel NULL pointer dereference at 00000048 IP: [<d0d7a08e>] nilfs_load_super_block+0x17e/0x280 [nilfs2] *pde = 00000000 Oops: 0000 [#1] PREEMPT SMP ... Call Trace: [<d0d7a87b>] init_nilfs+0x4b/0x2e0 [nilfs2] [<d0d6f707>] nilfs_mount+0x447/0x5b0 [nilfs2] [<c0226636>] mount_fs+0x36/0x180 [<c023d961>] vfs_kern_mount+0x51/0xa0 [<c023ddae>] do_kern_mount+0x3e/0xe0 [<c023f189>] do_mount+0x169/0x700 [<c023fa9b>] sys_mount+0x6b/0xa0 [<c04abd1f>] sysenter_do_call+0x12/0x28 Code: 53 18 8b 43 20 89 4b 18 8b 4b 24 89 53 1c 89 43 24 89 4b 20 8b 43 20 c7 43 2c 00 00 00 00 23 75 e8 8b 50 68 89 53 28 8b 54 b3 20 <8b> 72 48 8b 7a 4c 8b 55 08 89 b3 84 00 00 00 89 bb 88 00 00 00 EIP: [<d0d7a08e>] nilfs_load_super_block+0x17e/0x280 [nilfs2] SS:ESP 0068:ca9bbdcc CR2: 0000000000000048 This turned out due to a defect in an error path which runs if the calculated location of the secondary super block was invalid. This patch fixes it and eliminates the reported oops. Reported-by: Slicky Devil <slicky.dvl@gmail.com> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Tested-by: Slicky Devil <slicky.dvl@gmail.com> Cc: <stable@vger.kernel.org> [2.6.30+] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2012-03-16 17:14:44 -07:00
..
alloc.c
alloc.h
bmap.c
bmap.h
btnode.c
btnode.h
btree.c
btree.h
cpfile.c
cpfile.h
dat.c
dat.h
dir.c	nilfs: propagate umode_t	2012-01-03 22:55:04 -05:00
direct.c
direct.h
export.h
file.c	fs: push i_mutex and filemap_write_and_wait down into ->fsync() handlers	2011-07-20 20:47:59 -04:00
gcinode.c
ifile.c
ifile.h
inode.c	nilfs: propagate umode_t	2012-01-03 22:55:04 -05:00
ioctl.c	nilfs2: avoid overflowing segment numbers in nilfs_ioctl_clean_segments()	2012-02-08 19:03:51 -08:00
Kconfig
Makefile
mdt.c
mdt.h
namei.c	switch ->mknod() to umode_t	2012-01-03 22:54:54 -05:00
nilfs.h	nilfs: propagate umode_t	2012-01-03 22:55:04 -05:00
page.c
page.h
recovery.c
segbuf.c
segbuf.h
segment.c	freezer: unexport refrigerator() and update try_to_freeze() slightly	2011-11-21 12:32:22 -08:00
segment.h
sufile.c
sufile.h
super.c	vfs: switch ->show_options() to struct dentry *	2012-01-06 23:19:54 -05:00
the_nilfs.c	nilfs2: fix NULL pointer dereference in nilfs_load_super_block()	2012-03-16 17:14:44 -07:00
the_nilfs.h