4 files changed, 4 insertions, 0 deletions
diff --git a/src/process/posix_spawn_file_actions_addclose.c b/src/process/posix_spawn_file_actions_addclose.c
index cdda597..0c2ef8f 100644
--- a/src/process/posix_spawn_file_actions_addclose.c
+++ b/src/process/posix_spawn_file_actions_addclose.c
@@ -5,6 +5,7 @@
 
 int posix_spawn_file_actions_addclose(posix_spawn_file_actions_t *fa, int fd)
 {
+	if (fd < 0) return EBADF;
 	struct fdop *op = malloc(sizeof *op);
 	if (!op) return ENOMEM;
 	op->cmd = FDOP_CLOSE;
diff --git a/src/process/posix_spawn_file_actions_adddup2.c b/src/process/posix_spawn_file_actions_adddup2.c
index 0367498..addca4d 100644
--- a/src/process/posix_spawn_file_actions_adddup2.c
+++ b/src/process/posix_spawn_file_actions_adddup2.c
@@ -5,6 +5,7 @@
 
 int posix_spawn_file_actions_adddup2(posix_spawn_file_actions_t *fa, int srcfd, int fd)
 {
+	if (srcfd < 0 || fd < 0) return EBADF;
 	struct fdop *op = malloc(sizeof *op);
 	if (!op) return ENOMEM;
 	op->cmd = FDOP_DUP2;
diff --git a/src/process/posix_spawn_file_actions_addfchdir.c b/src/process/posix_spawn_file_actions_addfchdir.c
index 436c683..e89ede8 100644
--- a/src/process/posix_spawn_file_actions_addfchdir.c
+++ b/src/process/posix_spawn_file_actions_addfchdir.c
@@ -6,6 +6,7 @@
 
 int posix_spawn_file_actions_addfchdir_np(posix_spawn_file_actions_t *fa, int fd)
 {
+	if (fd < 0) return EBADF;
 	struct fdop *op = malloc(sizeof *op);
 	if (!op) return ENOMEM;
 	op->cmd = FDOP_FCHDIR;
diff --git a/src/process/posix_spawn_file_actions_addopen.c b/src/process/posix_spawn_file_actions_addopen.c
index 368922c..82bbcec 100644
--- a/src/process/posix_spawn_file_actions_addopen.c
+++ b/src/process/posix_spawn_file_actions_addopen.c
@@ -6,6 +6,7 @@
 
 int posix_spawn_file_actions_addopen(posix_spawn_file_actions_t *restrict fa, int fd, const char *restrict path, int flags, mode_t mode)
 {
+	if (fd < 0) return EBADF;
 	struct fdop *op = malloc(sizeof *op + strlen(path) + 1);
 	if (!op) return ENOMEM;
 	op->cmd = FDOP_OPEN;