[RFC PATCH 2a] pretty: detect missing \n\n in commit message

[Thomas Rast <trast@student.ethz.ch>]

get_header()'s exit condition is finding the \n\n that separates the
commit header from its message.  If such a double newline is not
present, it segfaults.  Catch this case and die().

Signed-off-by: Thomas Rast <trast@student.ethz.ch>
---

This would be the minimal fix to the pretty machinery so that 'git
rev-list --pretty=something HEAD' works when there are such broken
commits.

If 2b goes in, there isn't really any point as we would never get this
far on such a commit.


 pretty.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/pretty.c b/pretty.c
index 8688b8f..b7f097d 100644
--- a/pretty.c
+++ b/pretty.c
@@ -440,7 +440,10 @@ static char *get_header(const struct commit *commit, const char *key)
 	const char *line = commit->buffer;
 
 	for (;;) {
-		const char *eol = strchr(line, '\n'), *next;
+		const char *eol, *next;
+		if (!line)
+			die (_("malformed commit object: no separating \\n\\n?"));
+		eol = strchr(line, '\n');
 
 		if (line == eol)
 			return NULL;
-- 
1.7.9.2.467.g7fee4