[syzbot] [net?] [usb?] memory leak in rtl8150_set_multicast

[syzbot] [net?] [usb?] memory leak in rtl8150_set_multicast

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    d358e5254674 Merge tag 'for-6.19/dm-changes' of git://git...
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11e431c2580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=9a0268003e02068d
dashboard link: https://syzkaller.appspot.com/bug?extid=8dd915c7cb0490fc8c52
compiler:       gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12dd661a580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/e79f317bb571/disk-d358e525.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/cf9e2849af10/vmlinux-d358e525.xz
kernel image: https://storage.googleapis.com/syzbot-assets/73d80a967038/bzImage-d358e525.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8dd915c7cb0490fc8c52@syzkaller.appspotmail.com

BUG: memory leak
unreferenced object 0xffff888127d51010 (size 16):
  comm "dhcpcd", pid 5479, jiffies 4294951443
  hex dump (first 16 bytes):
    40 05 30 01 00 00 02 00 9e 00 00 00 00 00 00 00  @.0.............
  backtrace (crc 5546a3be):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4958 [inline]
    slab_alloc_node mm/slub.c:5263 [inline]
    __kmalloc_cache_noprof+0x3b2/0x570 mm/slub.c:5771
    kmalloc_noprof include/linux/slab.h:957 [inline]
    async_set_registers drivers/net/usb/rtl8150.c:192 [inline]
    rtl8150_set_multicast+0x7a/0x1c0 drivers/net/usb/rtl8150.c:679
    __dev_set_rx_mode+0xc5/0x120 net/core/dev.c:9655
    dev_set_rx_mode net/core/dev.c:9661 [inline]
    __dev_open+0x23f/0x3c0 net/core/dev.c:1691
    __dev_change_flags+0x30c/0x380 net/core/dev.c:9734
    netif_change_flags+0x35/0x90 net/core/dev.c:9797
    dev_change_flags+0x64/0xf0 net/core/dev_api.c:68
    devinet_ioctl+0x5bf/0xd30 net/ipv4/devinet.c:1199
    inet_ioctl+0x27c/0x2b0 net/ipv4/af_inet.c:1009
    sock_do_ioctl+0x84/0x1a0 net/socket.c:1254
    sock_ioctl+0x149/0x480 net/socket.c:1375
    vfs_ioctl fs/ioctl.c:51 [inline]
    __do_sys_ioctl fs/ioctl.c:597 [inline]
    __se_sys_ioctl fs/ioctl.c:583 [inline]
    __x64_sys_ioctl+0xf4/0x140 fs/ioctl.c:583
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

BUG: memory leak
unreferenced object 0xffff8881282bae40 (size 192):
  comm "dhcpcd", pid 5479, jiffies 4294951443
  hex dump (first 32 bytes):
    01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 58 ae 2b 28 81 88 ff ff  ........X.+(....
  backtrace (crc d110b1b3):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4958 [inline]
    slab_alloc_node mm/slub.c:5263 [inline]
    __do_kmalloc_node mm/slub.c:5656 [inline]
    __kmalloc_noprof+0x3e0/0x660 mm/slub.c:5669
    kmalloc_noprof include/linux/slab.h:961 [inline]
    usb_alloc_urb+0x66/0xa0 drivers/usb/core/urb.c:75
    async_set_registers drivers/net/usb/rtl8150.c:195 [inline]
    rtl8150_set_multicast+0x97/0x1c0 drivers/net/usb/rtl8150.c:679
    __dev_set_rx_mode+0xc5/0x120 net/core/dev.c:9655
    dev_set_rx_mode net/core/dev.c:9661 [inline]
    __dev_open+0x23f/0x3c0 net/core/dev.c:1691
    __dev_change_flags+0x30c/0x380 net/core/dev.c:9734
    netif_change_flags+0x35/0x90 net/core/dev.c:9797
    dev_change_flags+0x64/0xf0 net/core/dev_api.c:68
    devinet_ioctl+0x5bf/0xd30 net/ipv4/devinet.c:1199
    inet_ioctl+0x27c/0x2b0 net/ipv4/af_inet.c:1009
    sock_do_ioctl+0x84/0x1a0 net/socket.c:1254
    sock_ioctl+0x149/0x480 net/socket.c:1375
    vfs_ioctl fs/ioctl.c:51 [inline]
    __do_sys_ioctl fs/ioctl.c:597 [inline]
    __se_sys_ioctl fs/ioctl.c:583 [inline]
    __x64_sys_ioctl+0xf4/0x140 fs/ioctl.c:583
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xa4/0xf80 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

connection error: failed to recv *flatrpc.ExecutorMessageRawT: EOF


---
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Re: [syzbot] [net?] [usb?] memory leak in rtl8150_set_multicast

[Raka Gunarto]

async_set_registers() does not free the urb and req on the
usb_submit_urb() call fail path. Fix by freeing both objects.

Reported-by: syzbot+8dd915c7cb0490fc8c52@syzkaller.appspotmail.com
Signed-off-by: Raka Gunarto <rakagunarto@gmail.com>
---
 drivers/net/usb/rtl8150.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/usb/rtl8150.c b/drivers/net/usb/rtl8150.c
index 278e6cb6f4..0f6c700a85 100644
--- a/drivers/net/usb/rtl8150.c
+++ b/drivers/net/usb/rtl8150.c
@@ -211,6 +211,8 @@ static int async_set_registers(rtl8150_t *dev, u16
indx, u16 size, u16 reg)
                if (res == -ENODEV)
                        netif_device_detach(dev->netdev);
                dev_err(&dev->udev->dev, "%s failed with %d\n", __func__, res);
+               usb_free_urb(async_urb);
+               kfree(req);
        }
        return res;
 }
--
2.25.1