linux-kernel - [PATCH] proc: fix incorrect pde_is

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Date:   Thu, 18 Mar 2021 12:26:33 +0000
From:   Colin King <colin.king@...onical.com>
To:     Christian Brauner <christian.brauner@...ntu.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...gle.com>,
        linux-fsdevel@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] proc: fix incorrect pde_is_permanent check

From: Colin Ian King <colin.king@...onical.com>

Currently the pde_is_permanent check is being run on root multiple times
rather than on the next proc directory entry. This looks like a copy-paste
error.  Fix this by replacing root with next.

Addresses-Coverity: ("Copy-paste error")
Fixes: d919b33dafb3 ("proc: faster open/read/close with "permanent" files")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 fs/proc/generic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/proc/generic.c b/fs/proc/generic.c
index bc86aa87cc41..5600da30e289 100644
--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -756,7 +756,7 @@ int remove_proc_subtree(const char *name, struct proc_dir_entry *parent)
 	while (1) {
 		next = pde_subdir_first(de);
 		if (next) {
-			if (unlikely(pde_is_permanent(root))) {
+			if (unlikely(pde_is_permanent(next))) {
 				write_unlock(&proc_subdir_lock);
 				WARN(1, "removing permanent /proc entry '%s/%s'",
 					next->parent->name, next->name);
-- 
2.30.2