From: Peter H. <pet...@gm...> - 2014-07-29 21:20:56
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tpm...@li..., Jarkko Sakkinen <jar...@li...>, <st...@vg...>, Peter Huewe <pet...@gm...> Subject: [PATCH 3/5] tpm: missing tpm_chip_put in tpm_get_random() Date: Tue, 29 Jul 2014 23:25:40 +0200 Message-Id: <140...@gm...> X-Mailer: git-send-email 1.8.5.5 In-Reply-To: <140...@gm...> References: <201...@gm...> <140...@gm...> X-Provags-ID: V03:K0:CzrDQ1IEfd4LXlFvQHdqPC4ZazeldH/euUCOtxy+sPpZpbWDcoD n4iOFJsq3rM4eseWMA9qR/rKfZlp3SyJcKzk7grUfsy+PHyJ3iQ0iWf4HTZ2Uc5RB8tyUgs Se8KK+5QYfBOoQHYk4e0bhQSpF+097dDi2p+vbIHSlZTPqGctq2mgktKOit+3DV5m76ZRh/ y0ldU1IPFTtvHinXTTwoQ== From: Jarkko Sakkinen <jar...@li...> 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: <st...@vg...> # 3.7+ Signed-off-by: Jarkko Sakkinen <jar...@li...> Signed-off-by: Peter Huewe <pet...@gm...> --- 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 d175fb8..bef6cce 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); -- 1.8.5.5 |