mirror of https://gitee.com/openkylin/linux.git
b9d39d17e4
The inode destruction path for the 'dax' device filesystem incorrectly
assumes that the inode was initialized through 'alloc_dax()'. However,
if someone attempts to directly mount the dax filesystem with 'mount -t
dax dax mnt' that will bypass 'alloc_dax()' and the following failure
signatures may occur as a result:
kill_dax() must be called before final iput()
WARNING: CPU: 2 PID: 1188 at drivers/dax/super.c:243 dax_destroy_inode+0x48/0x50
RIP: 0010:dax_destroy_inode+0x48/0x50
Call Trace:
destroy_inode+0x3b/0x60
evict+0x139/0x1c0
iput+0x1f9/0x2d0
dentry_unlink_inode+0xc3/0x160
__dentry_kill+0xcf/0x180
? dput+0x37/0x3b0
dput+0x3a3/0x3b0
do_one_tree+0x36/0x40
shrink_dcache_for_umount+0x2d/0x90
generic_shutdown_super+0x1f/0x120
kill_anon_super+0x12/0x20
deactivate_locked_super+0x43/0x70
deactivate_super+0x4e/0x60
general protection fault: 0000 [#1] SMP DEBUG_PAGEALLOC
RIP: 0010:kfree+0x6d/0x290
Call Trace:
<IRQ>
dax_i_callback+0x22/0x60
? dax_destroy_inode+0x50/0x50
rcu_process_callbacks+0x298/0x740
ida_remove called for id=0 which is not allocated.
WARNING: CPU: 0 PID: 0 at lib/idr.c:383 ida_remove+0x110/0x120
[..]
Call Trace:
<IRQ>
ida_simple_remove+0x2b/0x50
? dax_destroy_inode+0x50/0x50
dax_i_callback+0x3c/0x60
rcu_process_callbacks+0x298/0x740
Add missing initialization of the 'struct dax_device' and inode so that
the destruction path does not kfree() or ida_simple_remove()
uninitialized data.
Fixes:
|
||
|---|---|---|
| .. | ||
| Kconfig | ||
| Makefile | ||
| dax-private.h | ||
| dax.h | ||
| device-dax.h | ||
| device.c | ||
| pmem.c | ||
| super.c | ||