linux-kernel - [PATCH v5 03/10] tpm, tpm_tis: Disable interrupts if tpm_tis_probe

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20220610110846.8307-4-LinoSanfilippo@gmx.de>
Date:   Fri, 10 Jun 2022 13:08:39 +0200
From:   LinoSanfilippo@....de
To:     peterhuewe@....de, jarkko@...nel.org, jgg@...pe.ca
Cc:     stefanb@...ux.vnet.ibm.com, linux@...ewoehner.de,
        linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        l.sanfilippo@...bus.com, LinoSanfilippo@....de, lukas@...ner.de,
        p.rosenberger@...bus.com
Subject: [PATCH v5 03/10] tpm, tpm_tis: Disable interrupts if tpm_tis_probe_irq() failed

From: Lino Sanfilippo <l.sanfilippo@...bus.com>

Both functions tpm_tis_probe_irq_single() and tpm_tis_probe_irq() may setup
the interrupts and then return with an error. This case is indicated by a
missing TPM_CHIP_FLAG_IRQ flag in chips->flags.
Currently the interrupt setup is only undone if tpm_tis_probe_irq_single()
fails. Undo the setup also if tpm_tis_probe_irq() fails.

Signed-off-by: Lino Sanfilippo <l.sanfilippo@...bus.com>
---
 drivers/char/tpm/tpm_tis_core.c | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index ee6b48c55ac9..dee701609b80 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -1077,21 +1077,21 @@ int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq,
 			goto out_err;
 		}
 
-		if (irq) {
+		if (irq)
 			tpm_tis_probe_irq_single(chip, intmask, IRQF_SHARED,
 						 irq);
-			if (!(chip->flags & TPM_CHIP_FLAG_IRQ)) {
-				dev_err(&chip->dev, FW_BUG
+		else
+			tpm_tis_probe_irq(chip, intmask);
+
+		if (!(chip->flags & TPM_CHIP_FLAG_IRQ)) {
+			dev_err(&chip->dev, FW_BUG
 					"TPM interrupt not working, polling instead\n");
 
-				rc = request_locality(chip, 0);
-				if (rc < 0)
-					goto out_err;
-				disable_interrupts(chip);
-				release_locality(chip, 0);
-			}
-		} else {
-			tpm_tis_probe_irq(chip, intmask);
+			rc = request_locality(chip, 0);
+			if (rc < 0)
+				goto out_err;
+			disable_interrupts(chip);
+			release_locality(chip, 0);
 		}
 	}
 
-- 
2.36.1