This is a note to let you know that I've just added the patch titled
tpm_tis: Explicitly check for error code
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
tpm_tis-explicitly-check-for-error-code.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 513253f8c293c0c8bd46d09d337fc892bf8f9f48 Mon Sep 17 00:00:00 2001
From: Alexander Steffen <Alexander.Steffen@xxxxxxxxxxxx>
Date: Tue, 13 Jun 2023 20:02:56 +0200
Subject: tpm_tis: Explicitly check for error code
From: Alexander Steffen <Alexander.Steffen@xxxxxxxxxxxx>
commit 513253f8c293c0c8bd46d09d337fc892bf8f9f48 upstream.
recv_data either returns the number of received bytes, or a negative value
representing an error code. Adding the return value directly to the total
number of received bytes therefore looks a little weird, since it might add
a negative error code to a sum of bytes.
The following check for size < expected usually makes the function return
ETIME in that case, so it does not cause too many problems in practice. But
to make the code look cleaner and because the caller might still be
interested in the original error code, explicitly check for the presence of
an error code and pass that through.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: cb5354253af2 ("[PATCH] tpm: spacing cleanups 2")
Signed-off-by: Alexander Steffen <Alexander.Steffen@xxxxxxxxxxxx>
Reviewed-by: Jarkko Sakkinen <jarkko@xxxxxxxxxx>
Signed-off-by: Jarkko Sakkinen <jarkko@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/char/tpm/tpm_tis_core.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -285,8 +285,13 @@ static int tpm_tis_recv(struct tpm_chip
goto out;
}
- size += recv_data(chip, &buf[TPM_HEADER_SIZE],
- expected - TPM_HEADER_SIZE);
+ rc = recv_data(chip, &buf[TPM_HEADER_SIZE],
+ expected - TPM_HEADER_SIZE);
+ if (rc < 0) {
+ size = rc;
+ goto out;
+ }
+ size += rc;
if (size < expected) {
dev_err(&chip->dev, "Unable to read remainder of result\n");
size = -ETIME;
Patches currently in stable-queue which might be from Alexander.Steffen@xxxxxxxxxxxx are
queue-5.4/tpm_tis-explicitly-check-for-error-code.patch
