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Message-ID: <20250402034529.12642-1-hexiaole1994@126.com>
Date: Wed, 2 Apr 2025 11:45:29 +0800
From: Xiaole He <hexiaole1994@....com>
To: viro@...iv.linux.org.uk,
brauner@...nel.org
Cc: jack@...e.cz,
linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org,
Xiaole He <hexiaole1994@....com>
Subject: [PATCH v1] fs/super.c: Add NULL check for type in iterate_supers_type
The first several lines of iterate_supers_type are below:
1 void iterate_supers_type(struct file_system_type *type,
2 void (*f)(struct super_block *, void *), void *arg)
3 {
4 struct super_block *sb, *p = NULL;
5
6 spin_lock(&sb_lock);
7 hlist_for_each_entry(sb, &type->fs_supers, s_instances) {
8 ...
9 }
The iterate_super_type is a exported symbol, and if iterate_supers_type
is called with type of NULL, then there will be a NULL pointer
dereference of argument type in line 7.
This patch fix above problem by adding NULL pointer check for argument
type.
Signed-off-by: Xiaole He <hexiaole1994@....com>
---
fs/super.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/fs/super.c b/fs/super.c
index 5a7db4a556e3..105a275b8360 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -959,6 +959,8 @@ void iterate_supers_type(struct file_system_type *type,
{
struct super_block *sb, *p = NULL;
+ if (unlikely(ZERO_OR_NULL_PTR(type)))
+ return;
spin_lock(&sb_lock);
hlist_for_each_entry(sb, &type->fs_supers, s_instances) {
bool locked;
--
2.43.0
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