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HID: wacom: Fix memory leakage caused by kfifo_alloc

Browse Source 
As reported by syzbot below, kfifo_alloc'd memory would not be freed
if a non-zero return value is triggered in wacom_probe. This patch
creates and uses devm_kfifo_alloc to allocate and free itself.

BUG: memory leak
unreferenced object 0xffff88810dc44a00 (size 512):
  comm "kworker/1:2", pid 3674, jiffies 4294943617 (age 14.100s)
  hex dump (first 32 bytes):
   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
   [<0000000023e1afac>] kmalloc_array include/linux/slab.h:592 [inline]
   [<0000000023e1afac>] __kfifo_alloc+0xad/0x100 lib/kfifo.c:43
   [<00000000c477f737>] wacom_probe+0x1a1/0x3b0 drivers/hid/wacom_sys.c:2727
   [<00000000b3109aca>] hid_device_probe+0x16b/0x210 drivers/hid/hid-core.c:2281
   [<00000000aff7c640>] really_probe+0x159/0x480 drivers/base/dd.c:554
   [<00000000778d0bc3>] driver_probe_device+0x84/0x100 drivers/base/dd.c:738
   [<000000005108dbb5>] __device_attach_driver+0xee/0x110 drivers/base/dd.c:844
   [<00000000efb7c59e>] bus_for_each_drv+0xb7/0x100 drivers/base/bus.c:431
   [<0000000024ab1590>] __device_attach+0x122/0x250 drivers/base/dd.c:912
   [<000000004c7ac048>] bus_probe_device+0xc6/0xe0 drivers/base/bus.c:491
   [<00000000b93050a3>] device_add+0x5ac/0xc30 drivers/base/core.c:2936
   [<00000000e5b46ea5>] hid_add_device+0x151/0x390 drivers/hid/hid-core.c:2437
   [<00000000c6add147>] usbhid_probe+0x412/0x560 drivers/hid/usbhid/hid-core.c:1407
   [<00000000c33acdb4>] usb_probe_interface+0x177/0x370 drivers/usb/core/driver.c:396
   [<00000000aff7c640>] really_probe+0x159/0x480 drivers/base/dd.c:554
   [<00000000778d0bc3>] driver_probe_device+0x84/0x100 drivers/base/dd.c:738
   [<000000005108dbb5>] __device_attach_driver+0xee/0x110 drivers/base/dd.c:844

https://syzkaller.appspot.com/bug?extid=5b49c9695968d7250a26

Reported-by: syzbot+5b49c9695968d7250a26@syzkaller.appspotmail.com
Signed-off-by: Ping Cheng <ping.cheng@wacom.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Ping Cheng 2020-12-09 20:52:30 -08:00 committed by Jiri Kosina
parent de925e2fbb
commit 37309f47e2
1 changed files with 32 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
drivers/hid/wacom_sys.c
View File

@ -1270,6 +1270,37 @@ static int wacom_devm_sysfs_create_group(struct wacom *wacom,
group);
}
static void wacom_devm_kfifo_release(struct device *dev, void *res)
{
struct kfifo_rec_ptr_2 *devres = res;
kfifo_free(devres);
}
static int wacom_devm_kfifo_alloc(struct wacom *wacom)
{
struct wacom_wac *wacom_wac = &wacom->wacom_wac;
struct kfifo_rec_ptr_2 *pen_fifo = &wacom_wac->pen_fifo;
int error;
pen_fifo = devres_alloc(wacom_devm_kfifo_release,
sizeof(struct kfifo_rec_ptr_2),
GFP_KERNEL);
if (!pen_fifo)
return -ENOMEM;
error = kfifo_alloc(pen_fifo, WACOM_PKGLEN_MAX, GFP_KERNEL);
if (error) {
devres_free(pen_fifo);
return error;
}
devres_add(&wacom->hdev->dev, pen_fifo);
return 0;
}
enum led_brightness wacom_leds_brightness_get(struct wacom_led *led)
{
struct wacom *wacom = led->wacom;
@ -2724,7 +2755,7 @@ static int wacom_probe(struct hid_device *hdev,
if (features->check_for_hid_type && features->hid_type != hdev->type)
return -ENODEV;
error = kfifo_alloc(&wacom_wac->pen_fifo, WACOM_PKGLEN_MAX, GFP_KERNEL);
error = wacom_devm_kfifo_alloc(wacom);
if (error)
return error;
@ -2786,8 +2817,6 @@ static void wacom_remove(struct hid_device *hdev)
if (wacom->wacom_wac.features.type != REMOTE)
wacom_release_resources(wacom);
kfifo_free(&wacom_wac->pen_fifo);
}
#ifdef CONFIG_PM