[PATCH v2 17/25] crypto: testmgr - Don't crash if CPRNG test result is large

[George Spelvin]

The idea is to catch as many programmer mistakes as possible.

Signed-off-by: George Spelvin <li...@horizon.com>
---
 crypto/testmgr.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/crypto/testmgr.c b/crypto/testmgr.c
index 9faf265f..6bf43682 100644
--- a/crypto/testmgr.c
+++ b/crypto/testmgr.c
@@ -1459,6 +1459,11 @@ static int test_cprng(struct crypto_rng *tfm,
        u8 result[32];
 
        for (i = 0; i < tcount; i++) {
+               if (template[i].rlen > sizeof(result)) {
+                       printk(KERN_CRIT "alg: cprng: Cannot test %s\n", algo);
+                       err = -EOVERFLOW;
+                       break;
+               }
                memset(result, 0, sizeof result);
 
                err = crypto_rng_reset(tfm, template[i].seed, template[i].slen);
-- 
2.1.3

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