Re: [PATCH 2/2] dir: remove PATH_MAX limitation

Am 05.07.2014 12:48, schrieb Duy Nguyen:

On Sat, Jul 5, 2014 at 5:42 AM, Karsten Blees [off-list ref] wrote:

quoted

'git status' segfaults if a directory is longer than PATH_MAX, because
processing .gitignore files in prep_exclude() writes past the end of a
PATH_MAX-bounded buffer.

Remove the limitation by using strbuf instead.

Note: this fix just 'abuses' strbuf as string allocator, len is always 0.
prep_exclude() can probably be simplified using more strbuf APIs.

FYI I had a similar patch [1] that attempted to lazily strbuf_init()
instead so that strbuf_ API could be used.

[1] http://article.gmane.org/gmane.comp.version-control.git/248310

Sorry, I missed that one.

In my version, strbuf_grow() does the lazy initialization (in fact, many
strbuf_* functions can handle memset(0) strbufs just fine).

I was simply too lazy to understand (again) how prep_exclude works exactly, and
as string calculations like that have the tendency to be just 1 char off, I went
for the obviously correct solution (i.e. s/dir->basebuf/dir->base.buf/ plus
strbuf_grow() before we write the buffer).

But IMO your version is much cleaner already.

However, api-strbuf.txt says that buf != NULL is invariant after init, and
alloc is "somehow private" :-) , so perhaps you should

-	if (!dir->basebuf.alloc)
+	if (!dir->basebuf.buf)
		strbuf_init(&dir->basebuf, PATH_MAX);

-- 
-- 
*** 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/d/optout.