Re: [PATCH] tpm: fix potential NULL pointer access in tpm_del_char_device()

On Fri, 2021-09-10 at 20:04 +0200, Lino Sanfilippo wrote:

In tpm_del_char_device() make sure that chip->ops is still valid. This check is needed since in case of a system shutdown tpm_class_shutdown() has already been called and set chip->ops to NULL. This leads to a NULL pointer access as soon as tpm_del_char_device() tries to access chip->ops in case of TPM 2.

Fixes: dcbeab1946454 ("tpm: fix crash in tpm_tis deinitialization") Cc: stable@vger.kernel.org Signed-off-by: Lino Sanfilippo LinoSanfilippo@gmx.de

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Have you been able to reproduce this in some environment?

/Jarkko