[PATCH 5.4 093/259] char: tpm: Fix possible memory leak in tpm_bios_measurements_open()

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5.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Joe Hattori <joe@xxxxxxxxxxxxxxxxxxxxx>

commit 5d8e2971e817bb64225fc0b6327a78752f58a9aa upstream.

In tpm_bios_measurements_open(), get_device() is called on the device
embedded in struct tpm_chip. In the error path, however, put_device() is
not called. This results in a reference count leak, which prevents the
device from being properly released. This commit makes sure to call
put_device() when the seq_open() call fails.

Cc: stable@xxxxxxxxxxxxxxx # +v4.18
Fixes: 9b01b5356629 ("tpm: Move shared eventlog functions to common.c")
Signed-off-by: Joe Hattori <joe@xxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Jarkko Sakkinen <jarkko@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/char/tpm/eventlog/common.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/char/tpm/eventlog/common.c
+++ b/drivers/char/tpm/eventlog/common.c
@@ -47,6 +47,8 @@ static int tpm_bios_measurements_open(st
 	if (!err) {
 		seq = file->private_data;
 		seq->private = chip;
+	} else {
+		put_device(&chip->dev);
 	}
 
 	return err;






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