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-rw-r--r--src/afl-forkserver.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/afl-forkserver.c b/src/afl-forkserver.c
index 78e2b555..a549e471 100644
--- a/src/afl-forkserver.c
+++ b/src/afl-forkserver.c
@@ -144,10 +144,12 @@ static u32 read_s32_timed(s32 fd, s32 *buf, u32 timeout_ms,
 
   if (!sret) {
 
+    *buf = -1;
     return timeout_ms + 1;
 
   } else if (sret < 0) {
 
+    *buf = -1;
     return 0;
 
   }