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mmc: vub300: fix return value check of mmc_add_host()

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mmc_add_host() may return error, if we ignore its return value, the memory
that allocated in mmc_alloc_host() will be leaked and it will lead a kernel
crash because of deleting not added device in the remove path.

So fix this by checking the return value and goto error path which will call
mmc_free_host(), besides, the timer added before mmc_add_host() needs be del.

And this patch fixes another missing call mmc_free_host() if usb_control_msg()
fails.

Fixes: 88095e7b47 ("mmc: Add new VUB300 USB-to-SD/SDIO/MMC driver")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20221101063023.1664968-9-yangyingliang@huawei.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Yang Yingliang 2022-11-01 14:30:22 +08:00 committed by Ulf Hansson
parent f670744a31
commit 0613ad2401
1 changed files with 8 additions and 3 deletions
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11
drivers/mmc/host/vub300.c
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@ -2299,14 +2299,14 @@ static int vub300_probe(struct usb_interface *interface,
0x0000, 0x0000, &vub300->system_port_status,
sizeof(vub300->system_port_status), 1000);
if (retval < 0) {
goto error4;
goto error5;
} else if (sizeof(vub300->system_port_status) == retval) {
vub300->card_present =
(0x0001 & vub300->system_port_status.port_flags) ? 1 : 0;
vub300->read_only =
(0x0010 & vub300->system_port_status.port_flags) ? 1 : 0;
} else {
goto error4;
goto error5;
}
usb_set_intfdata(interface, vub300);
INIT_DELAYED_WORK(&vub300->pollwork, vub300_pollwork_thread);
@ -2329,8 +2329,13 @@ static int vub300_probe(struct usb_interface *interface,
"USB vub300 remote SDIO host controller[%d]"
"connected with no SD/SDIO card inserted\n",
interface_to_InterfaceNumber(interface));
mmc_add_host(mmc);
retval = mmc_add_host(mmc);
if (retval)
goto error6;
return 0;
error6:
del_timer_sync(&vub300->inactivity_timer);
error5:
mmc_free_host(mmc);
/*