[PATCH] mingw-multibyte: fix memory acces violation and path length limits.

fix: Git for Windows crashes when clone Japanese multibyte repository.

Reproduce condition:

- Japanese Base Encoding is Shift-JIS.
- It happens Japanese multibyte directory name and too-long directory path
- Linux(ex. Ubuntu 13.04 amd64) can clone normally.
- example repository is here:

git clone https://github.com/wnoguchi/mingw-checkout-crash.git

- The reproduce crash repository contains following file only.
  - following directory and file name is encoded for this commit log.
  - actually file name is decoded.]
  %E6%97%A5%E6%9C%AC%E8%AA%9E%E3%83%87%E3%82%A3%E3%83%AC%E3%82%AF%E3%83%88%E3%83%AA%201-long-long-long-dirname/%E6%97%A5%E6%9C%AC%E8%AA%9E%E3%83%87%E3%82%A3%E3%83%AC%E3%82%AF%E3%83%88%E3%83%AA%202-long-long-long-dirname/%E6%97%A5%E6%9C%AC%E8%AA%9E%E3%83%87%E3%82%A3%E3%83%AC%E3%82%AF%E3%83%88%E3%83%AA%203-long-long-long-dirname/%E6%97%A5%E6%9C%AC%E8%AA%9E%E3%83%87%E3%82%A3%E3%83%AC%E3%82%AF%E3%83%88%E3%83%AA%204-long-long-long-dirname/%E6%97%A5%E6%9C%AC%E8%AA%9E%E3%83%87%E3%82%A3%E3%83%AC%E3%82%AF%E3%83%88%E3%83%AA%205-long-long-long-dirname/%E3%81%AF%E3%81%98%E3%82%81%E3%81%AB%E3%81%8A%E8%AA%AD%E3%81%BF%E3%81%8F%E3%81%A0%E3%81%95%E3%81%84.txt
- only one commit.

Cause:

- convert_attrs() in convert.c: if (!ccheck[0].attr) but ccheck[0].attr always not NULL.
  thus git_check_attr() in attr.c (check[i].attr->attr_nr) cause access violation.
- checkout_entry() in entry.c: static char path[PATH_MAX + 1]; declared.
  But its size is 261 on MinGW environment.
  This length is Windows full path limits. But for relative path is too short.

This commit fixes:

- convert_attrs() in convert.c: initialize ccheck[0].attr with NULL.
- git-compat-util.h: redifine PATH_MAX value to 4096 when MinGW environment.

Signed-off-by: Wataru Noguchi <redacted>
---
 convert.c         |  5 +++++
 git-compat-util.h | 10 ++++++++++
 2 files changed, 15 insertions(+)

diff --git a/convert.c b/convert.c
index 11a95fc..5eaa206 100644
--- a/convert.c
+++ b/convert.c

@@ -724,6 +724,11 @@ static void convert_attrs(struct conv_attrs *ca, const char *path)
 {
 	int i;
 	static struct git_attr_check ccheck[NUM_CONV_ATTRS];
+	
+	if (NUM_CONV_ATTRS != 0) {
+		ccheck[0].attr = NULL;
+		ccheck[0].value = NULL;
+	}
 
 	if (!ccheck[0].attr) {
 		for (i = 0; i < NUM_CONV_ATTRS; i++)

diff --git a/git-compat-util.h b/git-compat-util.h
index a31127f..ba02c69 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h

@@ -237,6 +237,16 @@ extern char *gitbasename(char *);
 #ifndef PATH_MAX
 #define PATH_MAX 4096
 #endif
+#ifdef GIT_WINDOWS_NATIVE
+/* Git for Windows checkout PATH_MAX is reduce to 260.
+ * but if checkout relative long path name, its length too short.
+ * thus, expand length.
+ */
+#ifdef PATH_MAX
+#undef PATH_MAX
+#endif
+#define PATH_MAX 4096
+#endif
 
 #ifndef PRIuMAX
 #define PRIuMAX "llu"

-- 
1.8.1.2

-- 
-- 
*** Please reply-to-all at all times ***
*** (do not pretend to know who is subscribed and who is not) ***
*** Please avoid top-posting. ***
The msysGit Wiki is here: https://github.com/msysgit/msysgit/wiki - Github accounts are free.

You received this message because you are subscribed to the Google
Groups "msysGit" group.
To post to this group, send email to msysgit@googlegroups.com
To unsubscribe from this group, send email to
msysgit+unsubscribe@googlegroups.com
For more options, and view previous threads, visit this group at
http://groups.google.com/group/msysgit?hl=en_US?hl=en

--- 
You received this message because you are subscribed to the Google Groups "msysGit" group.
To unsubscribe from this group and stop receiving emails from it, send an email to msysgit+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/groups/opt_out.