[PATCH v2] char: tpm: Fix possible memory leak in tpm_bios_measurements_open()

[Joe Hattori]

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.

Fixes: 9b01b5356629 ("tpm: Move shared eventlog functions to common.c")
Signed-off-by: Joe Hattori <j...@pf.is.s.u-tokyo.ac.jp>
---
Changes since v1:
- Keep the code diff minimal.
- Fix the commit message.
- Add a Fixes tag.
---
 drivers/char/tpm/eventlog/common.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/char/tpm/eventlog/common.c 
b/drivers/char/tpm/eventlog/common.c
index 639c3f395a5a..4c0bbba64ee5 100644
--- a/drivers/char/tpm/eventlog/common.c
+++ b/drivers/char/tpm/eventlog/common.c
@@ -47,6 +47,8 @@ static int tpm_bios_measurements_open(struct inode *inode,
        if (!err) {
                seq = file->private_data;
                seq->private = chip;
+       } else {
+               put_device(&chip->dev);
        }
 
        return err;
-- 
2.34.1