Jiufei Xue 660e9269d8 jbd2: check superblock mapped prior to committing ... commit 742b06b562 upstream. We hit a BUG at fs/buffer.c:3057 if we detached the nbd device before unmounting ext4 filesystem. The typical chain of events leading to the BUG: jbd2_write_superblock submit_bh submit_bh_wbc BUG_ON(!buffer_mapped(bh)); The block device is removed and all the pages are invalidated. JBD2 was trying to write journal superblock to the block device which is no longer present. Fix this by checking the journal superblock's buffer head prior to submitting. Reported-by: Eric Ren <renzhen@linux.alibaba.com> Signed-off-by: Jiufei Xue <jiufei.xue@linux.alibaba.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Reviewed-by: Jan Kara <jack@suse.cz> Cc: stable@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2019-05-21 18:50:18 +02:00
..
checkpoint.c	jbd2: fix use after free in jbd2_log_do_checkpoint()	2018-11-13 11:15:05 -08:00
commit.c	jbd2: fix invalid descriptor block checksum	2019-04-05 22:31:28 +02:00
journal.c	jbd2: check superblock mapped prior to committing	2019-05-21 18:50:18 +02:00
Kconfig	jbd2: remove debug dependency on debug_fs and update Kconfig help text	2013-06-12 23:07:51 -04:00
Makefile
recovery.c	fs: have ll_rw_block users pass in op and flags separately	2016-06-07 13:41:38 -06:00
revoke.c	jbd2: don't leak memory if setting up journal fails	2017-03-15 15:08:48 -04:00
transaction.c	jbd2: fix compile warning when using JBUFFER_TRACE	2019-03-23 14:35:26 +01:00