f2fs: fix to cover io->bio with io_rwsem
In the f2fs_wait_on_page_writeback, io->bio should be covered by io_rwsem.
Otherwise, the bio pointer can become a dangling pointer due to data races.
Signed-off-by: Jaegeuk Kim <[email protected]>
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index cb49e639..f799c6a 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -1049,15 +1049,14 @@
{
enum page_type btype = PAGE_TYPE_OF_BIO(type);
struct f2fs_bio_info *io = &sbi->write_io[btype];
- struct bio *bio = io->bio;
struct bio_vec *bvec;
int i;
down_read(&io->io_rwsem);
- if (!bio)
+ if (!io->bio)
goto out;
- bio_for_each_segment_all(bvec, bio, i) {
+ bio_for_each_segment_all(bvec, io->bio, i) {
if (page == bvec->bv_page) {
up_read(&io->io_rwsem);
return true;
