linux-kernel - Re: [syzbot] Re: [syzbot] [kernel?] upstream test error: KASAN: slab-use-after-free Write in binderfs_evict

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Message-ID: <67d26d72.050a0220.1939a6.0045.GAE@google.com>
Date: Wed, 12 Mar 2025 22:30:26 -0700
From: syzbot <syzbot+353d7b75658a95aa955a@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org
Subject: Re: [syzbot] Re: [syzbot] [kernel?] upstream test error: KASAN:
 slab-use-after-free Write in binderfs_evict_inode

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Subject: Re: [syzbot] [kernel?] upstream test error: KASAN: slab-use-after-free Write in binderfs_evict_inode
Author: lizhi.xu@...driver.com

#syz test

diff --git a/drivers/android/binderfs.c b/drivers/android/binderfs.c
index bc6bae76ccaf..9ac152548030 100644
--- a/drivers/android/binderfs.c
+++ b/drivers/android/binderfs.c
@@ -271,12 +271,12 @@ static void binderfs_evict_inode(struct inode *inode)
 	mutex_lock(&binderfs_minors_mutex);
 	--info->device_count;
 	ida_free(&binderfs_minors, device->miscdev.minor);
-	mutex_unlock(&binderfs_minors_mutex);
 
 	if (refcount_dec_and_test(&device->ref)) {
 		kfree(device->context.name);
 		kfree(device);
 	}
+	mutex_unlock(&binderfs_minors_mutex);
 }
 
 static int binderfs_fs_context_parse_param(struct fs_context *fc,