[PATCH 3.13 108/187] tpm: missing tpm_chip_put in tpm_get_random()

Kamal Mostafa
2014-09-15T22:11:12Z

From: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>

commit 3e14d83ef94a5806a865b85b513b4e891923c19b upstream.

Regression in 41ab999c. Call to tpm_chip_put is missing. This
will cause TPM device driver not to unload if tmp_get_random()
is called.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
drivers/char/tpm/tpm-interface.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index 6ae41d3..901b370 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -1400,13 +1400,13 @@ int tpm_get_random(u32 chip_num, u8 *out, size_t max)
int err, total = 0, retries = 5;
u8 *dest = out;

+ if (!out || !num_bytes || max > TPM_MAX_RNG_DATA)
+ return -EINVAL;
+
chip = tpm_chip_find_get(chip_num);
if (chip == NULL)
return -ENODEV;

- if (!out || !num_bytes || max > TPM_MAX_RNG_DATA)
- return -EINVAL;
-
do {
tpm_cmd.header.in = tpm_getrandom_header;
tpm_cmd.params.getrandom_in.num_bytes = cpu_to_be32(num_bytes);
@@ -1425,6 +1425,7 @@ int tpm_get_random(u32 chip_num, u8 *out, size_t max)
num_bytes -= recd;
} while (retries-- && total < max);

+ tpm_chip_put(chip);
return total ? total : -EIO;
}
EXPORT_SYMBOL_GPL(tpm_get_random);
--
1.9.1