[PATCH] shortlog: fix segfault on empty authorname

[Jeff King <peff@peff.net>]

The old code looked backwards from the email address to parse the name,
allowing an arbitrary number of spaces between the two. However, in the case
of no name, we looked back too far to the 'author' (or 'Author:') header.
Instead, remove at most one space between name and address.

The bug was triggered by commit febf7ea4bed from linux-2.6.

Signed-off-by: Jeff King <peff@peff.net>
---
 builtin-shortlog.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/builtin-shortlog.c b/builtin-shortlog.c
index f1124e2..7a2ddfe 100644
--- a/builtin-shortlog.c
+++ b/builtin-shortlog.c
@@ -188,7 +188,7 @@ static void read_from_stdin(struct path_list *list)
 				bob = buffer + strlen(buffer);
 			else {
 				offset = 8;
-				while (isspace(bob[-1]))
+				if (isspace(bob[-1]))
 					bob--;
 			}
 
@@ -236,7 +236,7 @@ static void get_from_rev(struct rev_info *rev, struct path_list *list)
 					author = scratch;
 					authorlen = strlen(scratch);
 				} else {
-					while (bracket[-1] == ' ')
+					if (bracket[-1] == ' ')
 						bracket--;
 
 					author = buffer + 7;
-- 
1.4.4.2.g3528-dirty

On Fri, Dec 08, 2006 at 10:23:14PM -0500, Nicolas Pitre wrote:

> On the Linux kernel repository, doing "git shortlog v2.6.18.." works 
> fine. "git shortlog v2.6.17.." works fine. "git shortlog v2.6.16.." also 
> works fine.  But "git shortlog v2.6.15.." dies with a segmentation 
> fault.  Trying "git log v2.6.15.. | git shortlog" also produces the same 
> crash while "git log v2.6.16.. | git shortlog" works fine.
> 
> The old perl version doesn't have any such issue with those test cases, 
> not even with the whole kernel history.
> 
> 
> Nicolas
> -
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