1 files changed, 7 insertions, 2 deletions
diff --git a/src/stdio/fseek.c b/src/stdio/fseek.c
index 439308f7..c7425802 100644
--- a/src/stdio/fseek.c
+++ b/src/stdio/fseek.c
@@ -1,7 +1,14 @@
 #include "stdio_impl.h"
+#include <errno.h>
 
 int __fseeko_unlocked(FILE *f, off_t off, int whence)
 {
+	/* Fail immediately for invalid whence argument. */
+	if (whence != SEEK_CUR && whence != SEEK_SET && whence != SEEK_END) {
+		errno = EINVAL;
+		return -1;
+	}
+
 	/* Adjust relative offset for unread data in buffer, if any. */
 	if (whence == SEEK_CUR && f->rend) off -= f->rend - f->rpos;
 
@@ -39,5 +46,3 @@ int fseek(FILE *f, long off, int whence)
 }
 
 weak_alias(__fseeko, fseeko);
-
-weak_alias(fseeko, fseeko64);