Theodore Ts'o b2569260d5 ext4: set h_journal if there is a failure starting a reserved handle ... If ext4 tries to start a reserved handle via jbd2_journal_start_reserved(), and the journal has been aborted, this can result in a NULL pointer dereference. This is because the fields h_journal and h_transaction in the handle structure share the same memory, via a union, so jbd2_journal_start_reserved() will clear h_journal before calling start_this_handle(). If this function fails due to an aborted handle, h_journal will still be NULL, and the call to jbd2_journal_free_reserved() will pass a NULL journal to sub_reserve_credits(). This can be reproduced by running "kvm-xfstests -c dioread_nolock generic/475". Cc: stable@kernel.org # 3.11 Fixes: 8f7d89f368 ("jbd2: transaction reservation support") Signed-off-by: Theodore Ts'o <tytso@mit.edu> Reviewed-by: Andreas Dilger <adilger@dilger.ca> Reviewed-by: Jan Kara <jack@suse.cz>		2018-04-18 11:49:31 -04:00
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Kconfig	jbd2: remove debug dependency on debug_fs and update Kconfig help text	2013-06-12 23:07:51 -04:00
Makefile	[PATCH] jbd2: rename jbd2 symbols to avoid duplication of jbd symbols	2006-10-11 11:14:15 -07:00
checkpoint.c	ext4: fix up remaining files with SPDX cleanups	2017-12-17 22:00:59 -05:00
commit.c	ext4: fix up remaining files with SPDX cleanups	2017-12-17 22:00:59 -05:00
journal.c	jbd2: if the journal is aborted then don't allow update of the log tail	2018-02-19 12:22:53 -05:00
recovery.c	jbd2: clarify bad journal block checksum message	2018-02-18 21:33:13 -05:00
revoke.c	ext4: fix up remaining files with SPDX cleanups	2017-12-17 22:00:59 -05:00
transaction.c	ext4: set h_journal if there is a failure starting a reserved handle	2018-04-18 11:49:31 -04:00