CVE-2022-50725: In the Linux kernel, the following vulnerability has been resolved: media: vidtv: Fix use-after-free in vidtv_bridge_dvb_init() KASAN reports a use-after-free…

PriorityP422

EPSS

0.21%

11.0th percentile

In the Linux kernel, the following vulnerability has been resolved: media: vidtv: Fix use-after-free in vidtv_bridge_dvb_init() KASAN reports a use-after-free: BUG: KASAN: use-after-free in dvb_dmxdev_release+0x4d5/0x5d0 [dvb_core] Call Trace: ... dvb_dmxdev_release+0x4d5/0x5d0 [dvb_core] vidtv_bridge_probe+0x7bf/0xa40 [dvb_vidtv_bridge] platform_probe+0xb6/0x170 ... Allocated by task 1238: ... dvb_register_device+0x1a7/0xa70 [dvb_core] dvb_dmxdev_init+0x2af/0x4a0 [dvb_core] vidtv_bridge_probe+0x766/0xa40 [dvb_vidtv_bridge] ... Freed by task 1238: dvb_register_device+0x6d2/0xa70 [dvb_core] dvb_dmxdev_init+0x2af/0x4a0 [dvb_core] vidtv_bridge_probe+0x766/0xa40 [dvb_vidtv_bridge] ... It is because the error handling in vidtv_bridge_dvb_init() is wrong. First, vidtv_bridge_dmx(dev)_init() will clean themselves when fail, but goto fail_dmx(_dev): calls release functions again, which causes use-after-free. Also, in fail_fe, fail_tuner_probe and fail_demod_probe, j = i will cause out-of-bound when i finished its loop (i == NUM_FE). And the loop releasing is wrong, although now NUM_FE is 1 so it won't cause problem. Fix this by correctly releasing everything.

Affected

15 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 6.1.4-1 (bookworm)	linux 6.1.4-1 (bookworm)
linux	linux	—	—
linux	linux	>= f90cf6079bf67988f8b1ad1ade70fc89d0080905 < 0369af6fe33d4053899b121b32e91f870b2cf0ae	0369af6fe33d4053899b121b32e91f870b2cf0ae
linux	linux	>= f90cf6079bf67988f8b1ad1ade70fc89d0080905 < c290aa527fd832d278c6388a3ba53a9890fbd74a	c290aa527fd832d278c6388a3ba53a9890fbd74a
linux	linux	>= f90cf6079bf67988f8b1ad1ade70fc89d0080905 < 06398ce69571a43a8a0dd0f1bfe35d221f726a6a	06398ce69571a43a8a0dd0f1bfe35d221f726a6a
linux	linux	>= f90cf6079bf67988f8b1ad1ade70fc89d0080905 < 8a204a0b4a0d105229735222c515759ea2b126c1	8a204a0b4a0d105229735222c515759ea2b126c1
linux	linux	>= f90cf6079bf67988f8b1ad1ade70fc89d0080905 < ba8d9405935097e296bcf7a942c3a01df0edb865	ba8d9405935097e296bcf7a942c3a01df0edb865
linux	linux_kernel	>= 0 < 5.10.178-1	5.10.178-1
linux	linux_kernel	>= 0 < 6.1.4-1	6.1.4-1
linux	linux_kernel	>= 0 < 6.1.4-1	6.1.4-1
linux	linux_kernel	>= 0 < 6.1.4-1	6.1.4-1
linux	linux_kernel	>= 5.10.0 < 5.10.163	5.10.163
linux	linux_kernel	>= 5.11.0 < 5.15.86	5.15.86
linux	linux_kernel	>= 5.16.0 < 6.0.16	6.0.16
linux	linux_kernel	>= 6.1.0 < 6.1.2	6.1.2

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