[PATCH] tpm: fix race condition in tpm_common_write()

[Tadeusz Struk]

On 05/23/2018 06:23 AM, Jarkko Sakkinen wrote:
> Ouch o_O Do you have a fixes tag for this one?
> 

This one is quite tricky.
The original bug was introduced by abce9ac292e13 (tpm: Propagate error from tpm_transmit to fix a timeout hang)
and the code back then was in drivers/char/tpm/tpm-interface.c file

Then there were two other commits that moved the code around:
afdba32e2a9ea (tpm: Pull everything related to /dev/tpmX into tpm-dev.c)
which moved it from drivers/char/tpm/tpm-interface.c into drivers/char/tpm/tpm-dev.c

and last one, ecb38e2f521b0 (tpm: split out tpm-dev.c into tpm-dev.c and tpm-common-dev.c)
which moved it from drivers/char/tpm/tpm-dev.c into tpm-common-dev.c

I have no idea how to tag it. Maybe we can use:
Fixes: ecb38e2f521b0 ("tpm: split out tpm-dev.c into tpm-dev.c and tpm-common-dev.c")

And then it probably needs to be back ported manually all the way back to abce9ac292e13.

Thanks,
-- 
Tadeusz
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