X-Git-Url: https://git.distorted.org.uk/u/mdw/putty/blobdiff_plain/d737853b942c17aeb9db09ef59046edd9daa652e..56668e6dca80813a2c9f03d4c02ed20e22f1061b:/sshrsa.c

diff --git a/sshrsa.c b/sshrsa.c
index 0c1b2ef5..163a92b0 100644
--- a/sshrsa.c
+++ b/sshrsa.c
@@ -110,7 +110,7 @@ static void sha512_mpint(SHA512_State * s, Bignum b)
 	lenbuf[0] = bignum_byte(b, len);
 	SHA512_Bytes(s, lenbuf, 1);
     }
-    memset(lenbuf, 0, sizeof(lenbuf));
+    smemclr(lenbuf, sizeof(lenbuf));
 }
 
 /*
@@ -526,6 +526,8 @@ static void getstring(char **data, int *datalen, char **p, int *length)
     if (*datalen < 4)
 	return;
     *length = GET_32BIT(*data);
+    if (*length < 0)
+        return;
     *datalen -= 4;
     *data += 4;
     if (*datalen < *length)