FAILED: patch "[PATCH] xfs: use null daddr for unset first bad log block" failed to apply to 5.15-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x cc9af5e461ea5f6e37738f3f1e41c45a9b7f45d6
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2026071429-showdown-footpad-d6da@gregkh' --subject-prefix 'PATCH 5.15.y' 'HEAD^..'

Possible dependencies:



thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From cc9af5e461ea5f6e37738f3f1e41c45a9b7f45d6 Mon Sep 17 00:00:00 2001
From: Yousef Alhouseen <alhouseenyousef@gmail.com>
Date: Tue, 30 Jun 2026 12:06:07 +0200
Subject: [PATCH] xfs: use null daddr for unset first bad log block

xlog_do_recovery_pass() may return before setting first_bad.  The caller
must distinguish that case from an error at a valid log block, including
block zero after the log wraps.

Initialize first_bad to XFS_BUF_DADDR_NULL and test it explicitly before
treating the error as a torn write.

Fixes: 7088c4136fa1 ("xfs: detect and trim torn writes during log recovery")
Suggested-by: Darrick J. Wong <djwong@kernel.org>
Reported-by: syzbot+b7dfbed0c6c2b5e9fd34@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=b7dfbed0c6c2b5e9fd34
Cc: stable@vger.kernel.org # v4.5
Signed-off-by: Yousef Alhouseen <alhouseenyousef@gmail.com>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Carlos Maiolino <cem@kernel.org>

diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
index 09e6678ca487..5f984bf5698a 100644
--- a/fs/xfs/xfs_log_recover.c
+++ b/fs/xfs/xfs_log_recover.c
@@ -1028,7 +1028,7 @@ xlog_verify_head(
 {
 	struct xlog_rec_header	*tmp_rhead;
 	char			*tmp_buffer;
-	xfs_daddr_t		first_bad;
+	xfs_daddr_t		first_bad = XFS_BUF_DADDR_NULL;
 	xfs_daddr_t		tmp_rhead_blk;
 	int			found;
 	int			error;
@@ -1057,7 +1057,8 @@ xlog_verify_head(
 	 */
 	error = xlog_do_recovery_pass(log, *head_blk, tmp_rhead_blk,
 				      XLOG_RECOVER_CRCPASS, &first_bad);
-	if ((error == -EFSBADCRC || error == -EFSCORRUPTED) && first_bad) {
+	if ((error == -EFSBADCRC || error == -EFSCORRUPTED) &&
+	    first_bad != XFS_BUF_DADDR_NULL) {
 		/*
 		 * We've hit a potential torn write. Reset the error and warn
 		 * about it.
@@ -3575,4 +3576,3 @@ xlog_recover_cancel(
 	if (xlog_recovery_needed(log))
 		xlog_recover_cancel_intents(log);
 }
-