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| author | Chao Yu <yuchao0@huawei.com> | 2020-03-19 19:58:00 +0800 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2020-03-30 20:46:24 -0700 |
| commit | 62f63eea291b50a5677ae7503ac128803174698a (patch) | |
| tree | 8873c75081824181f7a84468af9020089a38d3de | |
| parent | 8c7d4b57607bbcd1d754be58de34138d9429f3e4 (diff) | |
| download | linux-rt-62f63eea291b50a5677ae7503ac128803174698a.tar.gz | |
f2fs: fix NULL pointer dereference in f2fs_write_begin()
BUG: kernel NULL pointer dereference, address: 0000000000000000
RIP: 0010:f2fs_write_begin+0x823/0xb90 [f2fs]
Call Trace:
f2fs_quota_write+0x139/0x1d0 [f2fs]
write_blk+0x36/0x80 [quota_tree]
get_free_dqblk+0x42/0xa0 [quota_tree]
do_insert_tree+0x235/0x4a0 [quota_tree]
do_insert_tree+0x26e/0x4a0 [quota_tree]
do_insert_tree+0x26e/0x4a0 [quota_tree]
do_insert_tree+0x26e/0x4a0 [quota_tree]
qtree_write_dquot+0x70/0x190 [quota_tree]
v2_write_dquot+0x43/0x90 [quota_v2]
dquot_acquire+0x77/0x100
f2fs_dquot_acquire+0x2f/0x60 [f2fs]
dqget+0x310/0x450
dquot_transfer+0x7e/0x120
f2fs_setattr+0x11a/0x4a0 [f2fs]
notify_change+0x349/0x480
chown_common+0x168/0x1c0
do_fchownat+0xbc/0xf0
__x64_sys_fchownat+0x20/0x30
do_syscall_64+0x5f/0x220
entry_SYSCALL_64_after_hwframe+0x44/0xa9
Passing fsdata parameter to .write_{begin,end} in f2fs_quota_write(),
so that if quota file is compressed one, we can avoid above NULL
pointer dereference when updating quota content.
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
| -rw-r--r-- | fs/f2fs/super.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index 9f435191f1e5..252d4ea926bf 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -1929,6 +1929,7 @@ static ssize_t f2fs_quota_write(struct super_block *sb, int type, int offset = off & (sb->s_blocksize - 1); size_t towrite = len; struct page *page; + void *fsdata = NULL; char *kaddr; int err = 0; int tocopy; @@ -1938,7 +1939,7 @@ static ssize_t f2fs_quota_write(struct super_block *sb, int type, towrite); retry: err = a_ops->write_begin(NULL, mapping, off, tocopy, 0, - &page, NULL); + &page, &fsdata); if (unlikely(err)) { if (err == -ENOMEM) { congestion_wait(BLK_RW_ASYNC, @@ -1955,7 +1956,7 @@ retry: flush_dcache_page(page); a_ops->write_end(NULL, mapping, off, tocopy, tocopy, - page, NULL); + page, fsdata); offset = 0; towrite -= tocopy; off += tocopy; |