f2fs: avoid to access NULL pointer in issue_flush_thread
authorChao Yu <chao2.yu@samsung.com>
Mon, 7 Jul 2014 01:39:32 +0000 (09:39 +0800)
committerJaegeuk Kim <jaegeuk@kernel.org>
Wed, 9 Jul 2014 12:59:55 +0000 (05:59 -0700)
commit50e1f8d22199b557337b3d1ec8520e4c5aa5c76e
treeefae0ff87090bc8c6707eb2385ef2374f1ec256f
parent2743f865543c0c4a5e12fc13edb2bf89a6e9687c
f2fs: avoid to access NULL pointer in issue_flush_thread

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=75861

Denis 2014-05-10 11:28:59 UTC reported:
"F2FS-fs (mmcblk0p28): mounting..
 Unable to handle kernel NULL pointer dereference at virtual address 00000018
 ...
 [<c0a2f678>] (_raw_spin_lock+0x3c/0x70) from [<c03a0330>] (issue_flush_thread+0x50/0x17c)
 [<c03a0330>] (issue_flush_thread+0x50/0x17c) from [<c01b4064>] (kthread+0x98/0xa4)
 [<c01b4064>] (kthread+0x98/0xa4) from [<c0108060>] (kernel_thread_exit+0x0/0x8)"

This patch assign cmd_control_info in sm_info before issue_flush_thread is being
created, so this make sure that issue flush thread will have no chance to access
invalid info in fcc.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Reviewed-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
fs/f2fs/segment.c