From: Sebastien Dugué <sebastien.dugue@bull.net>
Date: Sat, 30 Dec 2006 00:46:53 +0000 (-0800)
Subject: [PATCH] Fix IPMI watchdog set_param_str() using kstrdup
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=43cdff92ad47e0ca024c8a07d29f9bb6119e759c;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

[PATCH] Fix IPMI watchdog set_param_str() using kstrdup

set_param_str() cannot use kstrdup() to duplicate the parameter.  That's
fine when the driver is compiled as a module but it sure is not when built
into the kernel as the kernel parameters are parsed before the kmalloc
slabs are setup.

Signed-off-by: Sebastien Dugué <sebastien.dugue@bull.net>
Acked-by: Corey Minyard <minyard@acm.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/drivers/char/ipmi/ipmi_watchdog.c b/drivers/char/ipmi/ipmi_watchdog.c
index 78280380a905..6b634e8d9519 100644
--- a/drivers/char/ipmi/ipmi_watchdog.c
+++ b/drivers/char/ipmi/ipmi_watchdog.c
@@ -216,13 +216,13 @@ static int set_param_str(const char *val, struct kernel_param *kp)
 {
 	action_fn  fn = (action_fn) kp->arg;
 	int        rv = 0;
-	char       *dup, *s;
+	char       valcp[16];
+	char       *s;
 
-	dup = kstrdup(val, GFP_KERNEL);
-	if (!dup)
-		return -ENOMEM;
+	strncpy(valcp, val, 16);
+	valcp[15] = '\0';
 
-	s = strstrip(dup);
+	s = strstrip(valcp);
 
 	down_read(&register_sem);
 	rv = fn(s, NULL);
@@ -235,7 +235,6 @@ static int set_param_str(const char *val, struct kernel_param *kp)
 
  out_unlock:
 	up_read(&register_sem);
-	kfree(dup);
 	return rv;
 }