From 872c930dcb048c1a2b50e6ce881c521dcee15e23 Mon Sep 17 00:00:00 2001
From: Jim Meyering <jim@meyering.net>
Date: Fri, 4 Jan 2008 18:37:41 +0100
Subject: 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>

diff --git a/builtin-grep.c b/builtin-grep.c
index f1ff8dc..0d6cc73 100644
--- a/builtin-grep.c
+++ b/builtin-grep.c
@@ -644,7 +644,7 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
 				die("'%s': %s", argv[1], strerror(errno));
 			while (fgets(buf, sizeof(buf), patterns)) {
 				int len = strlen(buf);
-				if (buf[len-1] == '\n')
+				if (len && buf[len-1] == '\n')
 					buf[len-1] = 0;
 				/* ignore empty line like grep does */
 				if (!buf[0])
diff --git a/builtin-pack-objects.c b/builtin-pack-objects.c
index e0ce114..a39cb82 100644
--- a/builtin-pack-objects.c
+++ b/builtin-pack-objects.c
@@ -2013,7 +2013,7 @@ static void get_object_list(int ac, const char **av)
 
 	while (fgets(line, sizeof(line), stdin) != NULL) {
 		int len = strlen(line);
-		if (line[len - 1] == '\n')
+		if (len && line[len - 1] == '\n')
 			line[--len] = 0;
 		if (!len)
 			break;
diff --git a/builtin-rev-list.c b/builtin-rev-list.c
index 1cb5f67..de80158 100644
--- a/builtin-rev-list.c
+++ b/builtin-rev-list.c
@@ -520,7 +520,7 @@ static void read_revisions_from_stdin(struct rev_info *revs)
 
 	while (fgets(line, sizeof(line), stdin) != NULL) {
 		int len = strlen(line);
-		if (line[len - 1] == '\n')
+		if (len && line[len - 1] == '\n')
 			line[--len] = 0;
 		if (!len)
 			break;
diff --git a/bundle.c b/bundle.c
index 9b9b916..be204d8 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);
diff --git a/server-info.c b/server-info.c
index a051e49..c1c073b 100644
--- a/server-info.c
+++ b/server-info.c
@@ -101,7 +101,7 @@ static int read_pack_info_file(const char *infofile)
 
 	while (fgets(line, sizeof(line), fp)) {
 		int len = strlen(line);
-		if (line[len-1] == '\n')
+		if (len && line[len-1] == '\n')
 			line[--len] = 0;
 
 		if (!len)
diff --git a/transport.c b/transport.c
index 4e151a9..babaa21 100644
--- a/transport.c
+++ b/transport.c
@@ -118,7 +118,7 @@ static void insert_packed_refs(const char *packed_refs, struct ref **list)
 		if (hexval(buffer[0]) > 0xf)
 			continue;
 		len = strlen(buffer);
-		if (buffer[len - 1] == '\n')
+		if (len && buffer[len - 1] == '\n')
 			buffer[--len] = '\0';
 		if (len < 41)
 			continue;
-- 
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