In the Linux kernel, the following vulnerability has been resolved:
staging: rtl8712: fix use-after-free in rtl8712_dl_fw
Syzbot reported use-after-free in rtl8712_dl_fw(). The problem was in
race condition between r871xu_dev_remove() ->ndo_open() callback.
It’s easy to see from crash log, that driver accesses released firmware
in ->ndo_open() callback. It may happen, since driver was releasing
firmware before unregistering netdev. Fix it by moving
unregister_netdev() before cleaning up resources.
Call Trace:
…
rtl871x_open_fw drivers/staging/rtl8712/hal_init.c:83 [inline]
rtl8712_dl_fw+0xd95/0xe10 drivers/staging/rtl8712/hal_init.c:170
rtl8712_hal_init drivers/staging/rtl8712/hal_init.c:330 [inline]
rtl871x_hal_init+0xae/0x180 drivers/staging/rtl8712/hal_init.c:394
netdev_open+0xe6/0x6c0 drivers/staging/rtl8712/os_intfs.c:380
__dev_open+0x2bc/0x4d0 net/core/dev.c:1484
Freed by task 1306:
…
release_firmware+0x1b/0x30 drivers/base/firmware_loader/main.c:1053
r871xu_dev_remove+0xcc/0x2c0 drivers/staging/rtl8712/usb_intf.c:599
usb_unbind_interface+0x1d8/0x8d0 drivers/usb/core/driver.c:458
[
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"drivers/staging/rtl8712/usb_intf.c"
],
"versions": [
{
"version": "8c213fa59199",
"lessThan": "c430094541a8",
"status": "affected",
"versionType": "git"
},
{
"version": "8c213fa59199",
"lessThan": "befd23bd3b17",
"status": "affected",
"versionType": "git"
},
{
"version": "8c213fa59199",
"lessThan": "a65c9afe9f2f",
"status": "affected",
"versionType": "git"
},
{
"version": "8c213fa59199",
"lessThan": "c052cc1a069c",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"drivers/staging/rtl8712/usb_intf.c"
],
"versions": [
{
"version": "3.3",
"status": "affected"
},
{
"version": "0",
"lessThan": "3.3",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.10.79",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.14.18",
"lessThanOrEqual": "5.14.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.15.2",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.16",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
]