MFH: check for buflen (on FreeBSD _SC_GETGR_R_SIZE_MAX is not implemented)

patch by stas at FreeBSD dot org

diff --git a/ext/posix/posix.c b/ext/posix/posix.c
index 0c377842643993b5e3b87e6079cf54832665b8d8..35910e0f28d1ef682156c0371a44c323cc338645 100644 (file)
--- a/ext/posix/posix.c
+++ b/ext/posix/posix.c
@@ -887,6 +887,10 @@ PHP_FUNCTION(posix_getgrgid)
 #if defined(ZTS) && defined(HAVE_GETGRGID_R) && defined(_SC_GETGR_R_SIZE_MAX)
        
        grbuflen = sysconf(_SC_GETGR_R_SIZE_MAX);
+       if (grbuflen < 1) {
+               RETURN_FALSE;
+       }
+
        grbuf = emalloc(grbuflen);
 
        ret = getgrgid_r(gid, &_g, grbuf, grbuflen, &retgrptr);