FAILED: patch "[PATCH] f2fs: validate MOVE_RANGE destination size" failed to apply to 5.10-stable tree

The patch below does not apply to the 5.10-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-5.10.y
git checkout FETCH_HEAD
git cherry-pick -x e533889fc26aea0cd83c90327063f272061dd820
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2026090933-statute-flanked-3d6c@gregkh' --subject-prefix 'PATCH 5.10.y' 'HEAD^..'

Possible dependencies:

thanks,

greg k-h

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

From e533889fc26aea0cd83c90327063f272061dd820 Mon Sep 17 00:00:00 2001
From: Wenjie Qi <[email protected]>
Date: Tue, 30 Jun 2026 11:17:00 +0800
Subject: [PATCH] f2fs: validate MOVE_RANGE destination size

F2FS_IOC_MOVE_RANGE checks the source range, but not the destination end before updating i_size. A source hole can expose this: __clone_blkaddrs() skips NULL_ADDR entries and returns success, so the caller can still extend the destination inode with unchecked pos_out + len.

Reject destination overflow and use inode_newsize_ok() before extending the destination inode.

index c54897a25981..170c485eafaa 100644
@@ -3127,8 +3127,9 @@ static int f2fs_move_file_range(struct file *file_in, loff_t pos_in,
 	struct inode *dst = file_inode(file_out);
 	struct f2fs_sb_info *sbi = F2FS_I_SB(src);
 	struct f2fs_lock_context lc;
-	size_t olen = len, dst_max_i_size = 0;
-	size_t dst_osize;
+	size_t olen = len;
+	loff_t dst_max_i_size = 0;
+	loff_t dst_osize, dst_end;
 	int ret;
 
 	if (file_in->f_path.mnt != file_out->f_path.mnt ||

@@ -3185,8 +3186,15 @@ static int f2fs_move_file_range(struct file *file_in, loff_t pos_in,
 	}
 
 	dst_osize = dst->i_size;
-	if (pos_out + olen > dst->i_size)
-		dst_max_i_size = pos_out + olen;
+	if (olen > LLONG_MAX - pos_out)
+		goto out_unlock;
+	dst_end = pos_out + olen;
+	if (dst_end > dst->i_size) {
+		ret = inode_newsize_ok(dst, dst_end);
+		if (ret)
+			goto out_unlock;
+		dst_max_i_size = dst_end;
+	}
 
 	/* verify the end result is block aligned */
 	if (!IS_ALIGNED(pos_in, F2FS_BLKSIZE) ||