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| author |   Pascal Eberhard <pascal.eberhard@gmail.com> | 2016-09-21 23:57:30 +0200 |
|---|---|---|
| committer |   Richard Weinberger <richard@nod.at> | 2016-10-02 22:55:02 +0200 |
| commit | 74e9c700bcb7529a0ab3f57d1125f4494ec97b3c (patch) | |
| tree | 16320c195fbaa8b970962cfccbf287da94530a80 /fs/ubifs | |
| parent | ubifs: Use move variable in ubifs_rename() (diff) | |
| download | wireguard-linux-74e9c700bcb7529a0ab3f57d1125f4494ec97b3c.tar.xz wireguard-linux-74e9c700bcb7529a0ab3f57d1125f4494ec97b3c.zip | |
ubifs: fix host xattr_len when changing xattr
When an extended attribute is changed, xattr_len of host inode is
recalculated. ui->data_len is updated before computation and result
is wrong. This patch adds a temporary variable to fix computation.
To reproduce the issue:
~# > a.txt
~# attr -s an-attr -V a-value a.txt
~# attr -s an-attr -V a-bit-bigger-value a.txt
Now host inode xattr_len is wrong. Forcing dbg_check_filesystem()
generates the following error:
[ 130.620140] UBIFS (ubi0:2): background thread "ubifs_bgt0_2" started, PID 565
[ 131.470790] UBIFS error (ubi0:2 pid 564): check_inodes: inode 646 has xattr size 240, but calculated size is 256
[ 131.481697] UBIFS (ubi0:2): dump of the inode 646 sitting in LEB 29:114688
[ 131.488953] magic 0x6101831
[ 131.492876] crc 0x9fce9091
[ 131.496836] node_type 0 (inode node)
[ 131.501193] group_type 1 (in node group)
[ 131.505788] sqnum 9278
[ 131.509191] len 160
[ 131.512549] key (646, inode)
[ 131.516688] creat_sqnum 9270
[ 131.520133] size 0
[ 131.523264] nlink 1
[ 131.526398] atime 1053025857.0
[ 131.530574] mtime 1053025857.0
[ 131.534714] ctime 1053025906.0
[ 131.538849] uid 0
[ 131.542009] gid 0
[ 131.545140] mode 33188
[ 131.548636] flags 0x1
[ 131.551977] xattr_cnt 1
[ 131.555108] xattr_size 240
[ 131.558420] xattr_names 12
[ 131.561670] compr_type 0x1
[ 131.564983] data len 0
[ 131.568125] UBIFS error (ubi0:2 pid 564): dbg_check_filesystem: file-system check failed with error -22
[ 131.578074] CPU: 0 PID: 564 Comm: mount Not tainted 4.4.12-g3639bea54a #24
[ 131.585352] Hardware name: Generic AM33XX (Flattened Device Tree)
[ 131.591918] [<c00151c0>] (unwind_backtrace) from [<c0012acc>] (show_stack+0x10/0x14)
[ 131.600177] [<c0012acc>] (show_stack) from [<c01c950c>] (dbg_check_filesystem+0x464/0x4d0)
[ 131.608934] [<c01c950c>] (dbg_check_filesystem) from [<c019f36c>] (ubifs_mount+0x14f8/0x2130)
[ 131.617991] [<c019f36c>] (ubifs_mount) from [<c00d7088>] (mount_fs+0x14/0x98)
[ 131.625572] [<c00d7088>] (mount_fs) from [<c00ed674>] (vfs_kern_mount+0x4c/0xd4)
[ 131.633435] [<c00ed674>] (vfs_kern_mount) from [<c00efb5c>] (do_mount+0x988/0xb50)
[ 131.641471] [<c00efb5c>] (do_mount) from [<c00f004c>] (SyS_mount+0x74/0xa0)
[ 131.648837] [<c00f004c>] (SyS_mount) from [<c000fe20>] (ret_fast_syscall+0x0/0x3c)
[ 131.665315] UBIFS (ubi0:2): background thread "ubifs_bgt0_2" stops
Signed-off-by: Pascal Eberhard <pascal.eberhard@gmail.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'fs/ubifs')
| -rw-r--r-- | fs/ubifs/xattr.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/fs/ubifs/xattr.c b/fs/ubifs/xattr.c index 11a004114eba..6c2f4d41ed73 100644 --- a/fs/ubifs/xattr.c +++ b/fs/ubifs/xattr.c @@ -200,6 +200,7 @@ static int change_xattr(struct ubifs_info *c, struct inode *host, struct ubifs_inode *host_ui = ubifs_inode(host); struct ubifs_inode *ui = ubifs_inode(inode); void *buf = NULL; + int old_size; struct ubifs_budget_req req = { .dirtied_ino = 2, .dirtied_ino_d = ALIGN(size, 8) + ALIGN(host_ui->data_len, 8) }; @@ -217,12 +218,13 @@ static int change_xattr(struct ubifs_info *c, struct inode *host, kfree(ui->data); ui->data = buf; inode->i_size = ui->ui_size = size; + old_size = ui->data_len; ui->data_len = size; mutex_unlock(&ui->ui_mutex); mutex_lock(&host_ui->ui_mutex); host->i_ctime = ubifs_current_time(host); - host_ui->xattr_size -= CALC_XATTR_BYTES(ui->data_len); + host_ui->xattr_size -= CALC_XATTR_BYTES(old_size); host_ui->xattr_size += CALC_XATTR_BYTES(size); /* @@ -241,7 +243,7 @@ static int change_xattr(struct ubifs_info *c, struct inode *host, out_cancel: host_ui->xattr_size -= CALC_XATTR_BYTES(size); - host_ui->xattr_size += CALC_XATTR_BYTES(ui->data_len); + host_ui->xattr_size += CALC_XATTR_BYTES(old_size); mutex_unlock(&host_ui->ui_mutex); make_bad_inode(inode); out_free: |