[PATCH] Limit filename for format-patch

[Robin Rosenberg <robin.rosenberg@dewire.com>]

Badly formatted commits may have very long comments. This causes
git-format-patch to fail. To avoid that, truncate the filename
to a value we believe will always work. 

Err out if the patch file cannot be created.

Signed-off-by: Robin Rosenberg <robin.rosenberg@dewire.com>
---

 builtin-log.c |   22 ++++++++++++++++------
 1 files changed, 16 insertions(+), 6 deletions(-)

Third edition. A buffer overflow fixed and more
peaceful sizeof syntax.

diff --git a/builtin-log.c b/builtin-log.c
index ad1e8c0..9054fd4 100644
--- a/builtin-log.c
+++ b/builtin-log.c
@@ -264,15 +264,17 @@ static int git_format_config(const char *var, const char *value)
 static FILE *realstdout = NULL;
 static const char *output_directory = NULL;
 
-static void reopen_stdout(struct commit *commit, int nr, int keep_subject)
+static int reopen_stdout(struct commit *commit, int nr, int keep_subject)
 {
-	char filename[1024];
+	char filename[PATH_MAX];
 	char *sol;
 	int len = 0;
-	int suffix_len = strlen(fmt_patch_suffix) + 10; /* ., NUL and slop */
+	int suffix_len = strlen(fmt_patch_suffix) + 1;
 
 	if (output_directory) {
-		strlcpy(filename, output_directory, 1000);
+		if (strlen(output_directory) >= sizeof(filename) - 64 - suffix_len)
+			return error("name of output directory is too long");
+		strlcpy(filename, output_directory, sizeof(filename) - suffix_len);
 		len = strlen(filename);
 		if (filename[len - 1] != '/')
 			filename[len++] = '/';
@@ -297,6 +299,7 @@ static void reopen_stdout(struct commit *commit, int nr, int keep_subject)
 		}
 
 		for (j = 0;
+		     j< 64-suffix_len-5 && 
 		     len < sizeof(filename) - suffix_len &&
 			     sol[j] && sol[j] != '\n';
 		     j++) {
@@ -314,10 +317,16 @@ static void reopen_stdout(struct commit *commit, int nr, int keep_subject)
 		}
 		while (filename[len - 1] == '.' || filename[len - 1] == '-')
 			len--;
+		filename[len] = 0;
 	}
+	if (len + suffix_len >= sizeof(filename))
+		return error("Patch pathname too long");
 	strcpy(filename + len, fmt_patch_suffix);
 	fprintf(realstdout, "%s\n", filename);
-	freopen(filename, "w", stdout);
+	if (freopen(filename, "w", stdout) == NULL)
+		return error("Cannot open patch file %s",filename);
+	return 0;
+	
 }
 
 static int get_patch_id(struct commit *commit, struct diff_options *options,
@@ -573,7 +582,8 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
 			rev.message_id = message_id;
 		}
 		if (!use_stdout)
-			reopen_stdout(commit, rev.nr, keep_subject);
+			if (reopen_stdout(commit, rev.nr, keep_subject))
+				die("Failed to create output files");
 		shown = log_tree_commit(&rev, commit);
 		free(commit->buffer);
 		commit->buffer = NULL;