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-rw-r--r--src/afl-sharedmem.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/afl-sharedmem.c b/src/afl-sharedmem.c
index 47185012..c5697e81 100644
--- a/src/afl-sharedmem.c
+++ b/src/afl-sharedmem.c
@@ -146,7 +146,7 @@ void setup_shm(unsigned char dumb_mode) {
 
   trace_bits = g_shm_base;
 
-  if (!trace_bits) PFATAL("mmap() failed");
+  if (trace_bits == -1 || !trace_bits) PFATAL("mmap() failed");
 
 #else
   u8 *shm_str;