Don't access line[-1] for a zero-length "line" from fgets.

A NUL byte at beginning of file, or just after a newline
would provoke an invalid buf[-1] access in a few places.

* builtin-grep.c (cmd_grep): Don't access buf[-1].
* builtin-pack-objects.c (get_object_list): Likewise.
* builtin-rev-list.c (read_revisions_from_stdin): Likewise.
* bundle.c (read_bundle_header): Likewise.
* server-info.c (read_pack_info_file): Likewise.
* transport.c (insert_packed_refs): Likewise.

Signed-off-by: Jim Meyering <meyering@redhat.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/bundle.c b/bundle.c
index 9b9b9166d..be204d8a2 100644
--- a/bundle.c
+++ b/bundle.c
@@ -48,7 +48,7 @@ int read_bundle_header(const char *path, struct bundle_header *header)
 			: &header->references;
 		char delim;
 
-		if (buffer[len - 1] == '\n')
+		if (len && buffer[len - 1] == '\n')
 			buffer[len - 1] = '\0';
 		if (get_sha1_hex(buffer + offset, sha1)) {
 			warning("unrecognized header: %s", buffer);