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authorJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>2014-05-09 14:23:10 +0300
committerPeter Huewe <peterhuewe@gmx.de>2014-07-29 23:10:55 +0200
commit3e14d83ef94a5806a865b85b513b4e891923c19b (patch)
treef5f24b21204faa237dfba9069703e6f45d66ddd8 /drivers/char
parentb49e1043c48dac23f64fba684d31c4a96c1ffaa0 (diff)
tpm: missing tpm_chip_put in tpm_get_random()
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. Cc: <stable@vger.kernel.org> # 3.7+ Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
Diffstat (limited to 'drivers/char')
-rw-r--r--drivers/char/tpm/tpm-interface.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index d175fb8e719a..bef6cceffc3a 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -991,13 +991,13 @@ 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);
@@ -1016,6 +1016,7 @@ 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);