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-rw-r--r--custom_mutators/aflpp/standalone/aflpp-standalone.c1
-rw-r--r--src/afl-showmap.c1
-rw-r--r--test/unittests/unit_rand.c1
3 files changed, 3 insertions, 0 deletions
diff --git a/custom_mutators/aflpp/standalone/aflpp-standalone.c b/custom_mutators/aflpp/standalone/aflpp-standalone.c
index 91bac4a8..361feaba 100644
--- a/custom_mutators/aflpp/standalone/aflpp-standalone.c
+++ b/custom_mutators/aflpp/standalone/aflpp-standalone.c
@@ -39,6 +39,7 @@ my_mutator_t *afl_custom_init(afl_state_t *afl, unsigned int seed) {
   data->afl = calloc(1, sizeof(afl_state_t));
   data->afl->queue_cycle = 1;
   data->afl->fsrv.dev_urandom_fd = open("/dev/urandom", O_RDONLY);
+  if (data->afl->fsrv.dev_urandom_fd < 0) { PFATAL("Unable to open /dev/urandom"); }
   rand_set_seed(data->afl, getpid());
 
   return data;
diff --git a/src/afl-showmap.c b/src/afl-showmap.c
index b82bcd72..7a639cf6 100644
--- a/src/afl-showmap.c
+++ b/src/afl-showmap.c
@@ -1611,6 +1611,7 @@ int main(int argc, char **argv_orig, char **envp) {
   if (in_dir || in_filelist) {
 
     afl->fsrv.dev_urandom_fd = open("/dev/urandom", O_RDONLY);
+    if (afl->fsrv.dev_urandom_fd < 0) { PFATAL("Unable to open /dev/urandom"); }
     afl->afl_env.afl_custom_mutator_library =
         getenv("AFL_CUSTOM_MUTATOR_LIBRARY");
     afl->afl_env.afl_python_module = getenv("AFL_PYTHON_MODULE");
diff --git a/test/unittests/unit_rand.c b/test/unittests/unit_rand.c
index 1ad02a80..f89b2ab5 100644
--- a/test/unittests/unit_rand.c
+++ b/test/unittests/unit_rand.c
@@ -67,6 +67,7 @@ static void test_rand_below(void **state) {
     rand_set_seed(&afl, 1337);
 
     afl.fsrv.dev_urandom_fd = open("/dev/urandom", O_RDONLY);
+    if (afl.fsrv.dev_urandom_fd < 0) { PFATAL("Unable to open /dev/urandom"); }
 
     assert(!(rand_below(&afl, 9000) > 9000));
     assert_int_equal(rand_below(&afl, 1), 0);