linux-kernel - Re: [syzbot] [kernel?] KASAN: slab-use-after-free Read in futex

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Message-ID: <20260211092221.2915-1-hdanton@sina.com>
Date: Wed, 11 Feb 2026 17:22:20 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+6c1861115b4253e45969@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [kernel?] KASAN: slab-use-after-free Read in futex_unqueue

> Date: Tue, 10 Feb 2026 13:43:32 -0800	[thread overview]
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    72c395024dac Merge tag 'docs-7.0' of git://git.kernel.org/..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=137d9b22580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=bf83be18dae53c93
> dashboard link: https://syzkaller.appspot.com/bug?extid=6c1861115b4253e45969
> compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=169f8ae6580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17f657fa580000

#syz test

--- x/fs/proc/task_mmu.c
+++ y/fs/proc/task_mmu.c
@@ -780,7 +780,7 @@ static int do_procmap_query(struct mm_st
 		} else {
 			if (karg.build_id_size < build_id_sz) {
 				err = -ENAMETOOLONG;
-				goto out;
+				goto out_file;
 			}
 			karg.build_id_size = build_id_sz;
 		}
@@ -808,6 +808,7 @@ static int do_procmap_query(struct mm_st
 out:
 	query_vma_teardown(&lock_ctx);
 	mmput(mm);
+out_file:
 	if (vm_file)
 		fput(vm_file);
 	kfree(name_buf);
--