mirror of
https://github.com/hardkernel/linux.git
synced 2026-06-05 10:31:46 +09:00
82e93a8359
[ Upstream commit bf617f7a92 ]
If noextent_cache mount option is on, we will never initialize extent tree
in inode, but still we're going to access it in f2fs_drop_extent_tree,
result in kernel panic as below:
BUG: unable to handle kernel NULL pointer dereference at 0000000000000038
IP: _raw_write_lock+0xc/0x30
Call Trace:
? f2fs_drop_extent_tree+0x41/0x70 [f2fs]
f2fs_fallocate+0x5a0/0xdd0 [f2fs]
? common_file_perm+0x47/0xc0
? apparmor_file_permission+0x1a/0x20
vfs_fallocate+0x15b/0x290
SyS_fallocate+0x44/0x70
do_syscall_64+0x6e/0x160
entry_SYSCALL64_slow_path+0x25/0x25
This patch fixes to check extent cache status before using in
f2fs_drop_extent_tree.
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.