>From dfc30988f5c32badd701d2db340ff5b945799917 Mon Sep 17 00:00:00 2001 From: Takeshi Misawa Date: Sun, 3 Jan 2021 15:46:19 +0900 Subject: [PATCH] [PATCH net] net: qrtr: Fix memory leak in qrtr_tun_open If qrtr_endpoint_register() failed, tun is leaked. Fix this, by freeing tun in error path. syzbot report: BUG: memory leak unreferenced object 0xffff88811848d680 (size 64): comm "syz-executor684", pid 10171, jiffies 4294951561 (age 26.070s) hex dump (first 32 bytes): 80 dd 0a 84 ff ff ff ff 00 00 00 00 00 00 00 00 ................ 90 d6 48 18 81 88 ff ff 90 d6 48 18 81 88 ff ff ..H.......H..... backtrace: [<0000000018992a50>] kmalloc include/linux/slab.h:552 [inline] [<0000000018992a50>] kzalloc include/linux/slab.h:682 [inline] [<0000000018992a50>] qrtr_tun_open+0x22/0x90 net/qrtr/tun.c:35 [<0000000003a453ef>] misc_open+0x19c/0x1e0 drivers/char/misc.c:141 [<00000000dec38ac8>] chrdev_open+0x10d/0x340 fs/char_dev.c:414 [<0000000079094996>] do_dentry_open+0x1e6/0x620 fs/open.c:817 [<000000004096d290>] do_open fs/namei.c:3252 [inline] [<000000004096d290>] path_openat+0x74a/0x1b00 fs/namei.c:3369 [<00000000b8e64241>] do_filp_open+0xa0/0x190 fs/namei.c:3396 [<00000000a3299422>] do_sys_openat2+0xed/0x230 fs/open.c:1172 [<000000002c1bdcef>] do_sys_open fs/open.c:1188 [inline] [<000000002c1bdcef>] __do_sys_openat fs/open.c:1204 [inline] [<000000002c1bdcef>] __se_sys_openat fs/open.c:1199 [inline] [<000000002c1bdcef>] __x64_sys_openat+0x7f/0xe0 fs/open.c:1199 [<00000000f3a5728f>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 [<000000004b38b7ec>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 Fixes: 28fb4e59a47d ("net: qrtr: Expose tunneling endpoint to user space") Reported-by: syzbot+5d6e4af21385f5cfc56a@syzkaller.appspotmail.com Signed-off-by: Takeshi Misawa --- net/qrtr/tun.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/net/qrtr/tun.c b/net/qrtr/tun.c index 15ce9b642b25..20d60a78590a 100644 --- a/net/qrtr/tun.c +++ b/net/qrtr/tun.c @@ -31,6 +31,7 @@ static int qrtr_tun_send(struct qrtr_endpoint *ep, struct sk_buff *skb) static int qrtr_tun_open(struct inode *inode, struct file *filp) { struct qrtr_tun *tun; + int ret; tun = kzalloc(sizeof(*tun), GFP_KERNEL); if (!tun) @@ -43,7 +44,17 @@ static int qrtr_tun_open(struct inode *inode, struct file *filp) filp->private_data = tun; - return qrtr_endpoint_register(&tun->ep, QRTR_EP_NID_AUTO); + ret = qrtr_endpoint_register(&tun->ep, QRTR_EP_NID_AUTO); + if (ret) { + goto out; + } + + return ret; + +out: + filp->private_data = NULL; + kfree(tun); + return ret; } static ssize_t qrtr_tun_read_iter(struct kiocb *iocb, struct iov_iter *to) -- 2.25.1