linux-kernel - [PATCH] powerpc: Fix kobject memleak

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Message-Id: <20190430010923.17092-1-tobin@kernel.org>
Date:   Tue, 30 Apr 2019 11:09:23 +1000
From:   "Tobin C. Harding" <tobin@...nel.org>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     "Tobin C. Harding" <tobin@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: [PATCH] powerpc: Fix kobject memleak

Currently error return from kobject_init_and_add() is not followed by a
call to kobject_put().  This means there is a memory leak.

Add call to kobject_put() in error path of kobject_init_and_add().

Signed-off-by: Tobin C. Harding <tobin@...nel.org>
---

Untested, did not even build.  Bad Tobin, no biscuit.

No call to kobject_uevent()?  I'll be back to check usage of
kobject_create_and_add() later, then I intend to check all the uevent
stuff, feel free to leave this for me to check later if you don't know
the reasoning straight off the top of your head.

thanks,
Tobin.

arch/powerpc/kernel/cacheinfo.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/arch/powerpc/kernel/cacheinfo.c b/arch/powerpc/kernel/cacheinfo.c
index 53102764fd2f..f2ed3ef4b129 100644
--- a/arch/powerpc/kernel/cacheinfo.c
+++ b/arch/powerpc/kernel/cacheinfo.c
@@ -759,23 +759,22 @@ static void cacheinfo_create_index_dir(struct cache *cache, int index,
 
 	index_dir = kzalloc(sizeof(*index_dir), GFP_KERNEL);
 	if (!index_dir)
-		goto err;
+		return;
 
 	index_dir->cache = cache;
 
 	rc = kobject_init_and_add(&index_dir->kobj, &cache_index_type,
 				  cache_dir->kobj, "index%d", index);
-	if (rc)
-		goto err;
+	if (rc) {
+		kobject_put(&index_dir->kobj);
+		kfree(index_dir);
+		return;
+	}
 
 	index_dir->next = cache_dir->index;
 	cache_dir->index = index_dir;
 
 	cacheinfo_create_index_opt_attrs(index_dir);
-
-	return;
-err:
-	kfree(index_dir);
 }
 
 static void cacheinfo_sysfs_populate(unsigned int cpu_id,
-- 
2.21.0