From 6e8e837864d4e24c2fdb4d90e8eb262ded78c3a8 Mon Sep 17 00:00:00 2001
From: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date: Sun, 28 Feb 2016 01:52:11 +0100
Subject: Fix mustbedir mechanism for symlinks

* libdiskfs/dir-lookup.c (diskfs_S_dir_lookup): When following a symlink,
if mustbedir is true, always append a slash to the symlink target, not only
when the target is absolute.  Reset mustbedir to 0 before continuing the
lookup loop.
* libnetfs/dir-lookup.c (netfs_S_dir_lookup): When following a symlink,
if mustbedir is true, append a slash to the symlink target. Reset mustbedir
to 0 before continuing the lookup loop.
* libtreefs/dir-lookup.c (_treefs_s_dir_lookup): Likewise.
---
 libdiskfs/dir-lookup.c | 17 +++++++++--------
 libnetfs/dir-lookup.c  | 11 +++++++++--
 libtreefs/dir-lookup.c | 11 +++++++++--
 3 files changed, 27 insertions(+), 12 deletions(-)

diff --git a/libdiskfs/dir-lookup.c b/libdiskfs/dir-lookup.c
index 8b986e49..c50970d2 100644
--- a/libdiskfs/dir-lookup.c
+++ b/libdiskfs/dir-lookup.c
@@ -421,24 +421,25 @@ diskfs_S_dir_lookup (struct protid *dircred,
 		  memcpy (pathbuf + np->dn_stat.st_size + 1,
 			  nextname, nextnamelen - 1);
 		}
-	      pathbuf[nextnamelen + np->dn_stat.st_size] = '\0';
+	      if (mustbedir)
+		{
+		  pathbuf[nextnamelen + np->dn_stat.st_size] = '/';
+		  pathbuf[nextnamelen + np->dn_stat.st_size + 1] = '\0';
+		}
+	      else
+		pathbuf[nextnamelen + np->dn_stat.st_size] = '\0';
 
 	      if (pathbuf[0] == '/')
 		{
 		  /* Punt to the caller.  */
 		  *retry = FS_RETRY_MAGICAL;
 		  *returned_port = MACH_PORT_NULL;
-		  memcpy (retryname, pathbuf,
-			  nextnamelen + np->dn_stat.st_size + 1);
-		  if (mustbedir)
-		    {
-		      retryname[nextnamelen + np->dn_stat.st_size] = '/';
-		      retryname[nextnamelen + np->dn_stat.st_size + 1] = '\0';
-		    }
+		  strcpy (retryname, pathbuf);
 		  goto out;
 		}
 
 	      path = pathbuf;
+	      mustbedir = 0;
 	    }
 
 	  if (lastcomp)
diff --git a/libnetfs/dir-lookup.c b/libnetfs/dir-lookup.c
index 1fefd3ff..cbe29419 100644
--- a/libnetfs/dir-lookup.c
+++ b/libnetfs/dir-lookup.c
@@ -367,7 +367,7 @@ netfs_S_dir_lookup (struct protid *diruser,
 	  linklen = np->nn_stat.st_size;
 
 	  nextnamelen = nextname ? strlen (nextname) + 1 : 0;
-	  newnamelen = nextnamelen + linklen + 1;
+	  newnamelen = nextnamelen + linklen + 1 + 1;
 	  linkbuf = alloca (newnamelen);
 
 	  error = netfs_attempt_readlink (diruser->user, np, linkbuf);
@@ -380,7 +380,13 @@ netfs_S_dir_lookup (struct protid *diruser,
 	      memcpy (linkbuf + linklen + 1, nextname,
 		     nextnamelen - 1);
 	    }
-	  linkbuf[nextnamelen + linklen] = '\0';
+	  if (mustbedir)
+	    {
+	      linkbuf[nextnamelen + linklen] = '/';
+	      linkbuf[nextnamelen + linklen + 1] = '\0';
+	    }
+	  else
+	    linkbuf[nextnamelen + linklen] = '\0';
 
 	  if (linkbuf[0] == '/')
 	    {
@@ -392,6 +398,7 @@ netfs_S_dir_lookup (struct protid *diruser,
 	    }
 
 	  filename = linkbuf;
+	  mustbedir = 0;
 	  if (lastcomp)
 	    {
 	      lastcomp = 0;
diff --git a/libtreefs/dir-lookup.c b/libtreefs/dir-lookup.c
index 8665059c..80b55388 100644
--- a/libtreefs/dir-lookup.c
+++ b/libtreefs/dir-lookup.c
@@ -229,7 +229,7 @@ _treefs_s_dir_lookup (struct treefs_handle *h,
 	    /* Symlink contents + extra path won't fit in our buffer, so
 	       reallocate it and try again.  */
 	    {
-	      path_buf_len = sym_len + nextname_len + 1;
+	      path_buf_len = sym_len + nextname_len + 1 + 1;
 	      path_buf = alloca (path_buf_len);
 	      err = treefs_node_get_symlink (node, path_buf, &sym_len);
 	    }
@@ -241,7 +241,13 @@ _treefs_s_dir_lookup (struct treefs_handle *h,
 	      path_buf[sym_len] = '/';
 	      bcopy (nextname, path_buf + sym_len + 1, nextname_len - 1);
 	    }
-	  path_buf[nextname_len + sym_len] = '\0';
+	  if (mustbedir)
+	    {
+	      path_buf[nextnamelen + sym_len] = '/';
+	      path_buf[nextnamelen + sym_len + 1] = '\0';
+	    }
+	  else
+	    path_buf[nextname_len + sym_len] = '\0';
 
 	  if (path_buf[0] == '/')
 	    {
@@ -253,6 +259,7 @@ _treefs_s_dir_lookup (struct treefs_handle *h,
 	    }
 	  
 	  path = path_buf;
+	  mustbedir = 0;
 	  if (lastcomp)
 	    {
 	      lastcomp = 0;
-- 
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