1 files changed, 4 insertions, 0 deletions
diff --git a/crypto/asn1/x_long.c b/crypto/asn1/x_long.c
index 233725f8ff..615d24df08 100644
--- a/crypto/asn1/x_long.c
+++ b/crypto/asn1/x_long.c
@@ -149,6 +149,10 @@ static int long_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
             utmp |= cont[i];
     }
     ltmp = (long)utmp;
+    if (ltmp < 0) {
+        ASN1err(ASN1_F_LONG_C2I, ASN1_R_INTEGER_TOO_LARGE_FOR_LONG);
+        return 0;
+    }
     if (neg) {
         ltmp = -ltmp;
         ltmp--;