Re: [PATCH] tpm2-sessions: Fix out of range indexing in name_size

[Greg KH <greg@kroah.com>]

On Thu, Jan 08, 2026 at 02:33:19PM +0200, Jarkko Sakkinen wrote:
> On Thu, Jan 08, 2026 at 02:31:59PM +0200, Jarkko Sakkinen wrote:
> > [ Upstream commit 6e9722e9a7bfe1bbad649937c811076acf86e1fd ]
> > 
> > 'name_size' does not have any range checks, and it just directly indexes
> > with TPM_ALG_ID, which could lead into memory corruption at worst.
> > 
> > Address the issue by only processing known values and returning -EINVAL for
> > unrecognized values.
> > 
> > Make also 'tpm_buf_append_name' and 'tpm_buf_fill_hmac_session' fallible so
> > that errors are detected before causing any spurious TPM traffic.
> > 
> > End also the authorization session on failure in both of the functions, as
> > the session state would be then by definition corrupted.
> > 
> > Cc: stable@vger.kernel.org # v6.10+
> > Fixes: 1085b8276bb4 ("tpm: Add the rest of the session HMAC API")
> > Reviewed-by: Jonathan McDowell <noodles@meta.com>
> > Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
> > ---
> 
> This is for v6.12.

Does not apply anymore to the latest 6.12.y release, can you rebase and
resend?

thanks,

greg k-h