FAILED: patch "[PATCH] cifs: fix integer overflow in match_server()" failed to apply to 5.4-stable tree

The patch below does not apply to the 5.4-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-5.4.y
git checkout FETCH_HEAD
git cherry-pick -x 2510859475d7f46ed7940db0853f3342bf1b65ee
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2025041700-afar-darkness-e9b8@gregkh' --subject-prefix 'PATCH 5.4.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

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

From 2510859475d7f46ed7940db0853f3342bf1b65ee Mon Sep 17 00:00:00 2001
From: Roman Smirnov <[email protected]>
Date: Mon, 31 Mar 2025 11:22:49 +0300
Subject: [PATCH] cifs: fix integer overflow in match_server()

The echo_interval is not limited in any way during mounting, which makes it possible to write a large number to it. This can cause an overflow when multiplying ctx->echo_interval by HZ in match_server().

Add constraints for echo_interval to smb3_fs_context_parse_param().

Found by Linux Verification Center (linuxtesting.org) with Svace.

index bdb762d398af..9c3ded0cf006 100644
@@ -1383,6 +1383,11 @@ static int smb3_fs_context_parse_param(struct fs_context *fc,
 		ctx->closetimeo = HZ * result.uint_32;
 		break;
 	case Opt_echo_interval:
+		if (result.uint_32 < SMB_ECHO_INTERVAL_MIN ||
+		    result.uint_32 > SMB_ECHO_INTERVAL_MAX) {
+			cifs_errorf(fc, "echo interval is out of bounds\n");
+			goto cifs_parse_mount_err;
+		}
 		ctx->echo_interval = result.uint_32;
 		break;
 	case Opt_snapshot:

From: Roman Smirnov <[email protected]>

[ Upstream commit 2510859475d7f46ed7940db0853f3342bf1b65ee ]

The echo_interval is not limited in any way during mounting, which makes it possible to write a large number to it. This can cause an overflow when multiplying ctx->echo_interval by HZ in match_server().

Add constraints for echo_interval to smb3_fs_context_parse_param().

Found by Linux Verification Center (linuxtesting.org) with Svace.

---
 fs/cifs/connect.c | 5 +++++
 1 file changed, 5 insertions(+)

index d8d9d90615440..93fc906f732bc 100644
@@ -2144,6 +2144,11 @@ cifs_parse_mount_options(const char *mountdata, const char *devname,
 					 __func__);
 				goto cifs_parse_mount_err;
 			}
+			if (option < SMB_ECHO_INTERVAL_MIN ||
+			    option > SMB_ECHO_INTERVAL_MAX) {
+				cifs_dbg(VFS, "echo interval is out of bounds\n");
+				goto cifs_parse_mount_err;
+			}
 			vol->echo_interval = option;
 			break;
 		case Opt_snapshot:

2.51.0