1 files changed, 8 insertions, 0 deletions

diff --git a/lib/libc/stdio/fseek.c b/lib/libc/stdio/fseek.c
index 8dc36e67d9b1..5af0bac848d8 100644
--- a/lib/libc/stdio/fseek.c
+++ b/lib/libc/stdio/fseek.c
@@ -155,6 +155,10 @@ _fseeko(fp, offset, whence, ltest)
 			errno = EINVAL;
 			return (EOF);
 		}
+		if (ltest && offset > LONG_MAX) {
+			errno = EOVERFLOW;
+			return (EOF);
+		}
 		whence = SEEK_SET;
 		havepos = 1;
 		break;
@@ -219,6 +223,10 @@ _fseeko(fp, offset, whence, ltest)
 			errno = EINVAL;
 			return (EOF);
 		}
+		if (ltest && (off_t)target > LONG_MAX) {
+			errno = EOVERFLOW;
+			return (EOF);
+		}
 	}
 
 	if (!havepos) {