[Pkg-shadow-devel] [PATCH] libmisc/addgrps.c: ngroups allocator fix

[Cal Peake]

Hi,

The memory allocator loop in function add_groups needs an extra check, 
otherwise it'll never actually try to allocate for more than 16 groups. 
A compile and run-time tested patch is below.

Notably, this quells the "Warning: add_groups: Invalid argument" message 
that Slackware (and presumably other non-PAM Linux) users get when logging 
in while also being a member of more than 16 groups.

Thanks and kind regards,

-- 
Cal Peake

--- ./libmisc/addgrps.c~	2011-02-13 12:58:11.000000000 -0500
+++ ./libmisc/addgrps.c	2011-05-05 14:53:38.000000000 -0400
@@ -71,7 +71,7 @@
 			return -1;
 		}
 		ngroups = getgroups (i, grouplist);
-		if ((-1 == ngroups) || (i > (size_t)ngroups)) {
+		if ((-1 == ngroups && EINVAL != errno) || (i > (size_t)ngroups)) {
 			break;
 		}
 		/* not enough room, so try allocating a larger buffer */