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| author | Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> | 2010-08-13 05:42:24 +0200 |
|---|---|---|
| committer | Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> | 2010-08-16 04:08:36 +0200 |
| commit | af4e36318edb848fcc0a8d5f75000ca00cdc7595 (patch) | |
| tree | c23ce8d1839f31ec4c472da184f16542a59752dd /fs/nilfs2/the_nilfs.c | |
| parent | Linux 2.6.36-rc1 (diff) | |
| download | linux-af4e36318edb848fcc0a8d5f75000ca00cdc7595.tar.xz linux-af4e36318edb848fcc0a8d5f75000ca00cdc7595.zip | |
nilfs2: fix list corruption after ifile creation failure
If nilfs_attach_checkpoint() gets a memory allocation failure during
creation of ifile, it will return without removing nilfs_sb_info
struct from ns_supers list. When a concurrently mounted snapshot is
unmounted or another new snapshot is mounted after that, this causes
kernel oops as below:
> BUG: unable to handle kernel NULL pointer dereference at (null)
> IP: [<f83662ff>] nilfs_find_sbinfo+0x74/0xa4 [nilfs2]
> *pde = 00000000
> Oops: 0000 [#1] SMP
<snip>
> Call Trace:
> [<f835dc29>] ? nilfs_get_sb+0x165/0x532 [nilfs2]
> [<c1173c87>] ? ida_get_new_above+0x16d/0x187
> [<c109a7f8>] ? alloc_vfsmnt+0x7e/0x10a
> [<c1070790>] ? kstrdup+0x2c/0x40
> [<c1089041>] ? vfs_kern_mount+0x96/0x14e
> [<c108913d>] ? do_kern_mount+0x32/0xbd
> [<c109b331>] ? do_mount+0x642/0x6a1
> [<c101a415>] ? do_page_fault+0x0/0x2d1
> [<c1099c00>] ? copy_mount_options+0x80/0xe2
> [<c10705d8>] ? strndup_user+0x48/0x67
> [<c109b3f1>] ? sys_mount+0x61/0x90
> [<c10027cc>] ? sysenter_do_call+0x12/0x22
This fixes the problem.
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Tested-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Cc: stable@kernel.org
Diffstat (limited to 'fs/nilfs2/the_nilfs.c')
0 files changed, 0 insertions, 0 deletions