FAILED: patch "[PATCH] xfs: fix integer overflow in bmap intent sort comparator" failed to apply to 6.12-stable tree

The patch below does not apply to the 6.12-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 <[email protected]>.

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-6.12.y
git checkout FETCH_HEAD
git cherry-pick -x 362c490980867930a098b99f421268fbd7ca05fd
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2026031754-spearmint-genetics-93f2@gregkh' --subject-prefix 'PATCH 6.12.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

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

From 362c490980867930a098b99f421268fbd7ca05fd Mon Sep 17 00:00:00 2001
From: Long Li <[email protected]>
Date: Tue, 10 Mar 2026 20:32:33 +0800
Subject: [PATCH] xfs: fix integer overflow in bmap intent sort comparator

xfs_bmap_update_diff_items() sorts bmap intents by inode number using a subtraction of two xfs_ino_t (uint64_t) values, with the result truncated to int. This is incorrect when two inode numbers differ by more than INT_MAX (2^31 - 1), which is entirely possible on large XFS filesystems.

Fix this by replacing the subtraction with cmp_int().

index e8775f254c89..b237a25d6045 100644
@@ -245,7 +245,7 @@ xfs_bmap_update_diff_items(
 	struct xfs_bmap_intent		*ba = bi_entry(a);
 	struct xfs_bmap_intent		*bb = bi_entry(b);
 
-	return ba->bi_owner->i_ino - bb->bi_owner->i_ino;
+	return cmp_int(ba->bi_owner->i_ino, bb->bi_owner->i_ino);
 }
 
 /* Log bmap updates in the intent item. */

From: Long Li <[email protected]>

[ Upstream commit 362c490980867930a098b99f421268fbd7ca05fd ]

xfs_bmap_update_diff_items() sorts bmap intents by inode number using a subtraction of two xfs_ino_t (uint64_t) values, with the result truncated to int. This is incorrect when two inode numbers differ by more than INT_MAX (2^31 - 1), which is entirely possible on large XFS filesystems.

Fix this by replacing the subtraction with cmp_int().

---
 fs/xfs/xfs_bmap_item.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

index 35a8c1b8b3cb3..5f10a61c9b25a 100644
@@ -237,7 +237,8 @@ xfs_bmap_update_diff_items(
 	struct xfs_bmap_intent		*ba = bi_entry(a);
 	struct xfs_bmap_intent		*bb = bi_entry(b);
 
-	return ba->bi_owner->i_ino - bb->bi_owner->i_ino;
+	return ((ba->bi_owner->i_ino > bb->bi_owner->i_ino) -
+		(ba->bi_owner->i_ino < bb->bi_owner->i_ino));
 }
 
 /* Log bmap updates in the intent item. */

2.51.0