X-Git-Url: https://git.distorted.org.uk/u/mdw/putty/blobdiff_plain/10e09fb5580b3016fcc4730c0a1562f484667988..e99cd73fed21152a2cea8d43cd76d33eda408b08:/sshrsa.c

diff --git a/sshrsa.c b/sshrsa.c
index baec83e0..4f95fb38 100644
--- a/sshrsa.c
+++ b/sshrsa.c
@@ -802,6 +802,7 @@ static unsigned char *rsa2_sign(void *key, char *data, int datalen,
     SHA_Simple(data, datalen, hash);
 
     nbytes = (bignum_bitcount(rsa->modulus) - 1) / 8;
+    assert(1 <= nbytes - 20 - ASN1_LEN);
     bytes = snewn(nbytes, unsigned char);
 
     bytes[0] = 1;