net: wan: Add checks for NULL for utdm in undo_uhdlc_init and unmap_si_regs
authorEsina Ekaterina <eesina@astralinux.ru>
Thu, 12 Jan 2023 07:47:03 +0000 (10:47 +0300)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 1 Feb 2023 07:27:08 +0000 (08:27 +0100)
commit95347e41cac62ca5f378a0533fcf564a4c610c8d
tree29069aefed6831289087964581b0c791638914a2
parent7f129927feaf7c10b1c38bbce630172e9a08c834
net: wan: Add checks for NULL for utdm in undo_uhdlc_init and unmap_si_regs

[ Upstream commit 488e0bf7f34af3d42d1d5e56f7a5a7beaff188a3 ]

If uhdlc_priv_tsa != 1 then utdm is not initialized.
And if ret != NULL then goto undo_uhdlc_init, where
utdm is dereferenced. Same if dev == NULL.

Found by Astra Linux on behalf of Linux Verification Center
(linuxtesting.org) with SVACE.

Fixes: 8d68100ab4ad ("soc/fsl/qe: fix err handling of ucc_of_parse_tdm")
Signed-off-by: Esina Ekaterina <eesina@astralinux.ru>
Link: https://lore.kernel.org/r/20230112074703.13558-1-eesina@astralinux.ru
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
drivers/net/wan/fsl_ucc_hdlc.c