X-Git-Url: https://git.distorted.org.uk/u/mdw/putty/blobdiff_plain/aacc46fab3288bb9ac32c5d50ccfb9c3ecbfd95d..af1da2469967bdb6fcabd17750d1c5f88a3389d0:/sshrsa.c

diff --git a/sshrsa.c b/sshrsa.c
index 77a6bb25..163a92b0 100644
--- a/sshrsa.c
+++ b/sshrsa.c
@@ -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)