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Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6

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Pull crypto fix from Herbert Xu:
 "This fixes a bug where qcom-rng can return a buffer that is not
  completely filled with random data"

* 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6:
  crypto: qcom-rng - ensure buffer for generate is completely filled
This commit is contained in:
Linus Torvalds 2022-03-16 11:50:35 -07:00
parent 56e337f2cf a680b1832c
commit d34c58247f
1 changed files with 10 additions and 7 deletions
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17
drivers/crypto/qcom-rng.c
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@ -8,6 +8,7 @@
#include <linux/clk.h>
#include <linux/crypto.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
@ -43,16 +44,19 @@ static int qcom_rng_read(struct qcom_rng *rng, u8 *data, unsigned int max)
{
unsigned int currsize = 0;
u32 val;
int ret;
/* read random data from hardware */
do {
val = readl_relaxed(rng->base + PRNG_STATUS);
if (!(val & PRNG_STATUS_DATA_AVAIL))
break;
ret = readl_poll_timeout(rng->base + PRNG_STATUS, val,
val & PRNG_STATUS_DATA_AVAIL,
200, 10000);
if (ret)
return ret;
val = readl_relaxed(rng->base + PRNG_DATA_OUT);
if (!val)
break;
return -EINVAL;
if ((max - currsize) >= WORD_SZ) {
memcpy(data, &val, WORD_SZ);
@ -61,11 +65,10 @@ static int qcom_rng_read(struct qcom_rng *rng, u8 *data, unsigned int max)
} else {
/* copy only remaining bytes */
memcpy(data, &val, max - currsize);
break;
}
} while (currsize < max);
return currsize;
return 0;
}
static int qcom_rng_generate(struct crypto_rng *tfm,
@ -87,7 +90,7 @@ static int qcom_rng_generate(struct crypto_rng *tfm,
mutex_unlock(&rng->lock);
clk_disable_unprepare(rng->clk);
return 0;
return ret;
}
static int qcom_rng_seed(struct crypto_rng *tfm, const u8 *seed,