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authorJaegeuk Kim <jaegeuk@kernel.org>2021-05-09 21:53:03 -0700
committerJaegeuk Kim <jaegeuk@kernel.org>2021-05-11 14:48:07 -0700
commit349c4d6c75d74b62d8e39913b40bd06117b85e4a (patch)
tree30c3d4f2450b5bc15b82c45f0e434640a1202c84 /fs/f2fs
parent6efb943b8616ec53a5e444193dccf1af9ad627b5 (diff)
downloadlinux-349c4d6c75d74b62d8e39913b40bd06117b85e4a.tar.bz2
f2fs: avoid null pointer access when handling IPU error
Unable to handle kernel NULL pointer dereference at virtual address 000000000000001a pc : f2fs_inplace_write_data+0x144/0x208 lr : f2fs_inplace_write_data+0x134/0x208 Call trace: f2fs_inplace_write_data+0x144/0x208 f2fs_do_write_data_page+0x270/0x770 f2fs_write_single_data_page+0x47c/0x830 __f2fs_write_data_pages+0x444/0x98c f2fs_write_data_pages.llvm.16514453770497736882+0x2c/0x38 do_writepages+0x58/0x118 __writeback_single_inode+0x44/0x300 writeback_sb_inodes+0x4b8/0x9c8 wb_writeback+0x148/0x42c wb_do_writeback+0xc8/0x390 wb_workfn+0xb0/0x2f4 process_one_work+0x1fc/0x444 worker_thread+0x268/0x4b4 kthread+0x13c/0x158 ret_from_fork+0x10/0x18 Fixes: 955772787667 ("f2fs: drop inplace IO if fs status is abnormal") Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs')
-rw-r--r--fs/f2fs/segment.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index c605415840b5..51dc79fad4fe 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -3574,12 +3574,12 @@ int f2fs_inplace_write_data(struct f2fs_io_info *fio)
return err;
drop_bio:
- if (fio->bio) {
+ if (fio->bio && *(fio->bio)) {
struct bio *bio = *(fio->bio);
bio->bi_status = BLK_STS_IOERR;
bio_endio(bio);
- fio->bio = NULL;
+ *(fio->bio) = NULL;
}
return err;
}