(skip): Use fseeko rather than lseek.

(Also, check for overflow when converting uintmax_t to off_t.)

1 files changed, 4 insertions, 1 deletions

diff --git a/src/od.c b/src/od.c
index ad73bb252..a08a7a5a2 100644
--- a/src/od.c
+++ b/src/od.c
@@ -1081,7 +1081,10 @@ skip (uintmax_t n_skip)
 		n_skip -= file_stats.st_size;
 	      else
 		{
-		  if (lseek (fileno (in_stream), n_skip, SEEK_CUR) < 0)
+		  off_t offset = n_skip;
+		  if (offset == n_skip && 0 <= offset
+		      ? fseeko (in_stream, offset, SEEK_CUR) != 0
+		      : (errno = EOVERFLOW, 1))
 		    {
 		      error (0, errno, "%s", input_filename);
 		      err = 1;