FAILED: patch "[PATCH] init/main.c: Fix potential static_command_line memory" 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 46dad3c1e57897ab9228332f03e1c14798d2d3b9
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2024042347-create-item-ebf8@gregkh' --subject-prefix 'PATCH 5.4.y' HEAD^..

Possible dependencies:

46dad3c1e578 ("init/main.c: Fix potential static_command_line memory overflow")

thanks,

greg k-h

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

From 46dad3c1e57897ab9228332f03e1c14798d2d3b9 Mon Sep 17 00:00:00 2001
From: Yuntao Wang <[email protected]>
Date: Fri, 12 Apr 2024 16:17:32 +0800
Subject: [PATCH] init/main.c: Fix potential static_command_line memory
overflow

We allocate memory of size 'xlen + strlen(boot_command_line) + 1' for static_command_line, but the strings copied into static_command_line are extra_command_line and command_line, rather than extra_command_line and boot_command_line.

When strlen(command_line) > strlen(boot_command_line), static_command_line will overflow.

This patch just recovers strlen(command_line) which was miss-consolidated with strlen(boot_command_line) in the commit f5c7310ac73e ("init/main: add checks for the return value of memblock_alloc*()")

index 881f6230ee59..5dcf5274c09c 100644
@@ -636,6 +636,8 @@ static void __init setup_command_line(char *command_line)
 	if (!saved_command_line)
 		panic("%s: Failed to allocate %zu bytes\n", __func__, len + ilen);
 
+	len = xlen + strlen(command_line) + 1;
+
 	static_command_line = memblock_alloc(len, SMP_CACHE_BYTES);
 	if (!static_command_line)
 		panic("%s: Failed to allocate %zu bytes\n", __func__, len);