Re: [PATCH net] mwifiex: Fix possible memleak in probe and disconnect

Wang Hai [off-list ref] wrote:

I got memory leak as follows when doing fault injection test:

unreferenced object 0xffff888031c2f000 (size 512):
  comm "kworker/0:2", pid 165, jiffies 4294922253 (age 391.180s)
  hex dump (first 32 bytes):
    00 20 f7 08 80 88 ff ff 01 00 00 00 00 00 00 00  . ..............
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<00000000537bdb86>] kmem_cache_alloc_trace+0x16d/0x360
    [<0000000047666fab>] if_usb_probe+0x90/0x96e [usb8xxx]
    [<00000000de44b4f0>] usb_probe_interface+0x31b/0x800 [usbcore]
    [<000000009b1a1951>] really_probe+0x299/0xc30
    [<0000000055b8ffce>] __driver_probe_device+0x357/0x500
    [<00000000bb0c7161>] driver_probe_device+0x4e/0x140
    [<00000000866d1730>] __device_attach_driver+0x257/0x340
    [<0000000084e79b96>] bus_for_each_drv+0x166/0x1e0
    [<000000009bad60ea>] __device_attach+0x272/0x420
    [<00000000236b97c1>] bus_probe_device+0x1eb/0x2a0
    [<000000008d77d7cf>] device_add+0xbf0/0x1cd0
    [<000000004af6a3f0>] usb_set_configuration+0x10fb/0x18d0 [usbcore]
    [<000000002ebdfdcd>] usb_generic_driver_probe+0xa2/0xe0 [usbcore]
    [<00000000444f344d>] usb_probe_device+0xe4/0x2b0 [usbcore]
    [<000000009b1a1951>] really_probe+0x299/0xc30
    [<0000000055b8ffce>] __driver_probe_device+0x357/0x500

cardp is missing being freed in the error handling path of the probe
and the path of the disconnect, which will cause kmemleak.

This patch adds the missing free().

Fixes: 876c9d3aeb98 ("[PATCH] Marvell Libertas 8388 802.11b/g USB driver")
Fixes: c305a19a0d0a ("libertas_tf: usb specific functions")
Reported-by: Hulk Robot <redacted>
Signed-off-by: Wang Hai <redacted>

mwifiex patches are applied to wireless-drivers, not to the net tree. Please be
careful how you mark your patches.

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/20211018063818.1895774-1-wanghai38@huawei.com/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches