sdsrange overflow fix (#830)

Fix overflow bug in `sdsrange`

1 files changed, 3 insertions, 3 deletions

diff --git a/hiredis.c b/hiredis.c
index 3133716..4487134 100644
--- a/hiredis.c
+++ b/hiredis.c
@@ -920,17 +920,17 @@ int redisBufferWrite(redisContext *c, int *done) {
         return REDIS_ERR;
 
     if (sdslen(c->obuf) > 0) {
-        int nwritten = c->funcs->write(c);
+        ssize_t nwritten = c->funcs->write(c);
         if (nwritten < 0) {
             return REDIS_ERR;
         } else if (nwritten > 0) {
-            if (nwritten == (signed)sdslen(c->obuf)) {
+            if (nwritten == (ssize_t)sdslen(c->obuf)) {
                 sdsfree(c->obuf);
                 c->obuf = sdsempty();
                 if (c->obuf == NULL)
                     goto oom;
             } else {
-                sdsrange(c->obuf,nwritten,-1);
+                if (sdsrange(c->obuf,nwritten,-1) < 0) goto oom;
             }
         }
     }