Fix signed integer overflow in evp_enc

Fixes #17869.

Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/17870)

1 files changed, 7 insertions, 0 deletions

diff --git a/test/sanitytest.c b/test/sanitytest.c
index b1aadc4aa8..ec850651d2 100644
--- a/test/sanitytest.c
+++ b/test/sanitytest.c
@@ -114,6 +114,13 @@ static int test_sanity_range(void)
         TEST_error("int must not be wider than size_t");
         return 0;
     }
+
+    /* SIZE_MAX is always greater than 2*INT_MAX */
+    if (SIZE_MAX - INT_MAX <= INT_MAX) {
+        TEST_error("SIZE_MAX must exceed 2*INT_MAX");
+        return 0;
+    }
+
     return 1;
 }