linux/drivers/misc
Lv Yunlong b9c87ce3bc misc/libmasm/module: Fix two use after free in ibmasm_init_one
[ Upstream commit 7272b591c4 ]

In ibmasm_init_one, it calls ibmasm_init_remote_input_dev().
Inside ibmasm_init_remote_input_dev, mouse_dev and keybd_dev are
allocated by input_allocate_device(), and assigned to
sp->remote.mouse_dev and sp->remote.keybd_dev respectively.

In the err_free_devices error branch of ibmasm_init_one,
mouse_dev and keybd_dev are freed by input_free_device(), and return
error. Then the execution runs into error_send_message error branch
of ibmasm_init_one, where ibmasm_free_remote_input_dev(sp) is called
to unregister the freed sp->remote.mouse_dev and sp->remote.keybd_dev.

My patch add a "error_init_remote" label to handle the error of
ibmasm_init_remote_input_dev(), to avoid the uaf bugs.

Signed-off-by: Lv Yunlong <lyl2019@mail.ustc.edu.cn>
Link: https://lore.kernel.org/r/20210426170620.10546-1-lyl2019@mail.ustc.edu.cn
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2021-07-20 16:05:38 +02:00
..
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c2port
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habanalabs habanalabs: Fix an error handling path in 'hl_pci_probe()' 2021-07-14 16:56:47 +02:00
ibmasm misc/libmasm/module: Fix two use after free in ibmasm_init_one 2021-07-20 16:05:38 +02:00
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