add ELOOP support; shigio@wafu.netgate.net

1 files changed, 6 insertions, 1 deletions

diff --git a/src/lib/libc/stdlib/realpath.c b/src/lib/libc/stdlib/realpath.c
index 51e336efdd..78c286014d 100644
--- a/src/lib/libc/stdlib/realpath.c
+++ b/src/lib/libc/stdlib/realpath.c
@@ -35,7 +35,7 @@
  */
 
 #if defined(LIBC_SCCS) && !defined(lint)
-static char *rcsid = "$OpenBSD: realpath.c,v 1.2 1996/08/19 08:33:47 tholo Exp $";
+static char *rcsid = "$OpenBSD: realpath.c,v 1.3 1997/06/20 20:37:45 deraadt Exp $";
 #endif /* LIBC_SCCS and not lint */
 
 #include <sys/param.h>
@@ -62,6 +62,7 @@ realpath(path, resolved)
         struct stat sb;
         int fd, n, rootd, serrno;
         char *p, *q, wbuf[MAXPATHLEN];
+        int symlinks = 0;
 
         /* Save the starting point. */
         if ((fd = open(".", O_RDONLY)) < 0) {
@@ -100,6 +101,10 @@ loop:
         /* Deal with the last component. */
         if (lstat(p, &sb) == 0) {
                 if (S_ISLNK(sb.st_mode)) {
+                        if (++symlinks > MAXSYMLINKS) {
+                                errno = ELOOP;
+                                goto err1;
+                        }
                         n = readlink(p, resolved, MAXPATHLEN);
                         if (n < 0)
                                 goto err1;