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| author | Eric Dumazet <edumazet@google.com> | 2019-10-04 11:08:34 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-10-07 18:57:22 +0200 |
| commit | dd9c580a6d9b4a30195e7d12a8d2ee0b2f1c5e71 (patch) | |
| tree | 05f51068bab7cfc2c7628ce53093bb3088fc3085 | |
| parent | d5b1db1c7ce4198bbbd51160350bdd446c8ed2ba (diff) | |
| download | linux-stable-dd9c580a6d9b4a30195e7d12a8d2ee0b2f1c5e71.tar.gz linux-stable-dd9c580a6d9b4a30195e7d12a8d2ee0b2f1c5e71.tar.bz2 linux-stable-dd9c580a6d9b4a30195e7d12a8d2ee0b2f1c5e71.zip | |
nfc: fix memory leak in llcp_sock_bind()
[ Upstream commit a0c2dc1fe63e2869b74c1c7f6a81d1745c8a695d ]
sysbot reported a memory leak after a bind() has failed.
While we are at it, abort the operation if kmemdup() has failed.
BUG: memory leak
unreferenced object 0xffff888105d83ec0 (size 32):
comm "syz-executor067", pid 7207, jiffies 4294956228 (age 19.430s)
hex dump (first 32 bytes):
00 69 6c 65 20 72 65 61 64 00 6e 65 74 3a 5b 34 .ile read.net:[4
30 32 36 35 33 33 30 39 37 5d 00 00 00 00 00 00 026533097]......
backtrace:
[<0000000036bac473>] kmemleak_alloc_recursive /./include/linux/kmemleak.h:43 [inline]
[<0000000036bac473>] slab_post_alloc_hook /mm/slab.h:522 [inline]
[<0000000036bac473>] slab_alloc /mm/slab.c:3319 [inline]
[<0000000036bac473>] __do_kmalloc /mm/slab.c:3653 [inline]
[<0000000036bac473>] __kmalloc_track_caller+0x169/0x2d0 /mm/slab.c:3670
[<000000000cd39d07>] kmemdup+0x27/0x60 /mm/util.c:120
[<000000008e57e5fc>] kmemdup /./include/linux/string.h:432 [inline]
[<000000008e57e5fc>] llcp_sock_bind+0x1b3/0x230 /net/nfc/llcp_sock.c:107
[<000000009cb0b5d3>] __sys_bind+0x11c/0x140 /net/socket.c:1647
[<00000000492c3bbc>] __do_sys_bind /net/socket.c:1658 [inline]
[<00000000492c3bbc>] __se_sys_bind /net/socket.c:1656 [inline]
[<00000000492c3bbc>] __x64_sys_bind+0x1e/0x30 /net/socket.c:1656
[<0000000008704b2a>] do_syscall_64+0x76/0x1a0 /arch/x86/entry/common.c:296
[<000000009f4c57a4>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
Fixes: 30cc4587659e ("NFC: Move LLCP code to the NFC top level diirectory")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | net/nfc/llcp_sock.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/net/nfc/llcp_sock.c b/net/nfc/llcp_sock.c index ff254e8c0c44..e0a2cb8a029f 100644 --- a/net/nfc/llcp_sock.c +++ b/net/nfc/llcp_sock.c @@ -119,9 +119,14 @@ static int llcp_sock_bind(struct socket *sock, struct sockaddr *addr, int alen) llcp_sock->service_name = kmemdup(llcp_addr.service_name, llcp_sock->service_name_len, GFP_KERNEL); - + if (!llcp_sock->service_name) { + ret = -ENOMEM; + goto put_dev; + } llcp_sock->ssap = nfc_llcp_get_sdp_ssap(local, llcp_sock); if (llcp_sock->ssap == LLCP_SAP_MAX) { + kfree(llcp_sock->service_name); + llcp_sock->service_name = NULL; ret = -EADDRINUSE; goto put_dev; } |