read_data_into_fd: Print correct error code

If lseek fails to seek to correct position, e.g. because the descriptor
is in append mode, do not use errno because it's not set.

In such a case, fall back to ARCHIVE_ERRNO_MISC.

Signed-off-by: Tobias Stoeckmann <tobias@stoeckmann.org>

diff --git a/libarchive/archive_read_data_into_fd.c b/libarchive/archive_read_data_into_fd.c
index 8fd5e12442bc43b9c821fa99f527e0925df943ae..8d56d70428417c9fe283e3557092758d5ca431ea 100644 (file)
--- a/libarchive/archive_read_data_into_fd.c
+++ b/libarchive/archive_read_data_into_fd.c
@@ -56,7 +56,9 @@ pad_to(struct archive *a, int fd, int can_lseek,
                actual_offset = lseek(fd,
                    target_offset - actual_offset, SEEK_CUR);
                if (actual_offset != target_offset) {
-                       archive_set_error(a, errno, "Seek error");
+                       archive_set_error(a,
+                           actual_offset == -1 ? errno : ARCHIVE_ERRNO_MISC,
+                           "Seek error");
                        return (ARCHIVE_FATAL);
                }
                return (ARCHIVE_OK);