[PATCH v2] tpm: acpi: Fix memory leak at tpm_read_log_acpi() error path

[Takashi Iwai <tiwai@suse.de>]

When devm_add_action() returns an error, tpm_read_log_acpi() clears
log->bios_event_log unnecessarily to NULL before calling
tpm_bios_log_free(), and it would lead to a memory leak of the
allocated log buffer.

Fix it by simply jumping to the err.

Cc: <stable@vger.kernel.org>
Fixes: a3a860bc0fd6 ("tpm: Change to kvalloc() in eventlog/acpi.c")
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
v1->v2: minor update of patch description and tags order

 drivers/char/tpm/eventlog/acpi.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/char/tpm/eventlog/acpi.c b/drivers/char/tpm/eventlog/acpi.c
index cf02ec646f46..50770cafa835 100644
--- a/drivers/char/tpm/eventlog/acpi.c
+++ b/drivers/char/tpm/eventlog/acpi.c
@@ -167,10 +167,8 @@ int tpm_read_log_acpi(struct tpm_chip *chip)
 	}
 
 	ret = devm_add_action(&chip->dev, tpm_bios_log_free, log->bios_event_log);
-	if (ret) {
-		log->bios_event_log = NULL;
+	if (ret)
 		goto err;
-	}
 
 	return format;
 
-- 
2.53.0