From d4d80e69927ab5da67026c1c94e23c305dbc799e Mon Sep 17 00:00:00 2001
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Date: Fri, 3 Jul 2020 14:10:14 -0400
Subject: [PATCH] Call sysctl_head_finish on error
This error path returned directly instead of calling sysctl_head_finish().
Fixes: ef9d965bc8b6 ("sysctl: reject gigantic reads/write to sysctl files")
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
fs/proc/proc_sysctl.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index 42c5128c7d1c7..6c1166ccdaea5 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -566,8 +566,9 @@ static ssize_t proc_sys_call_handler(struct file *filp, void __user *ubuf,
goto out;
/* don't even try if the size is too large */
- if (count > KMALLOC_MAX_SIZE)
- return -ENOMEM;
+ error = -ENOMEM;
+ if (count >= KMALLOC_MAX_SIZE)
+ goto out;
if (write) {
kbuf = memdup_user_nul(ubuf, count);
@@ -576,7 +577,6 @@ static ssize_t proc_sys_call_handler(struct file *filp, void __user *ubuf,
goto out;
}
} else {
- error = -ENOMEM;
kbuf = kzalloc(count, GFP_KERNEL);
if (!kbuf)
goto out;
--
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