FAILED: patch "[PATCH] ocfs2: strict bound check before memcmp in" failed to apply to 5.15-stable tree

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 <[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-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x af77c4fc1871847b528d58b7fdafb4aa1f6a9262
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2024072555-hubcap-monetary-01bc@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:

af77c4fc1871 ("ocfs2: strict bound check before memcmp in ocfs2_xattr_find_entry()")

thanks,

greg k-h

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

From af77c4fc1871847b528d58b7fdafb4aa1f6a9262 Mon Sep 17 00:00:00 2001
From: Ferry Meng <[email protected]>
Date: Mon, 20 May 2024 10:40:24 +0800
Subject: [PATCH] ocfs2: strict bound check before memcmp in
ocfs2_xattr_find_entry()

xattr in ocfs2 maybe 'non-indexed', which saved with additional space requested. It's better to check if the memory is out of bound before memcmp, although this possibility mainly comes from crafted poisonous images.

index 8aea94c90739..35c0cc2a51af 100644
@@ -1068,7 +1068,7 @@ static int ocfs2_xattr_find_entry(struct inode *inode, int name_index,
 {
 	struct ocfs2_xattr_entry *entry;
 	size_t name_len;
-	int i, cmp = 1;
+	int i, name_offset, cmp = 1;
 
 	if (name == NULL)
 		return -EINVAL;

@@ -1083,10 +1083,15 @@ static int ocfs2_xattr_find_entry(struct inode *inode, int name_index,
 		cmp = name_index - ocfs2_xattr_get_type(entry);
 		if (!cmp)
 			cmp = name_len - entry->xe_name_len;
-		if (!cmp)
-			cmp = memcmp(name, (xs->base +
-				     le16_to_cpu(entry->xe_name_offset)),
-				     name_len);
+		if (!cmp) {
+			name_offset = le16_to_cpu(entry->xe_name_offset);
+			if ((xs->base + name_offset + name_len) > xs->end) {
+				ocfs2_error(inode->i_sb,
+					    "corrupted xattr entries");
+				return -EFSCORRUPTED;
+			}
+			cmp = memcmp(name, (xs->base + name_offset), name_len);
+		}
 		if (cmp == 0)
 			break;
 		entry += 1;