dir: check afs_dir_Create return code in afs_dir_MakeDir

afs_dir_MakeDir() ignores the return code from afs_dir_Create() for the
'.' and '..' ("dot" and "dotdot") directories.  This has been the case
from the earliest implementation (MakeDir() calling Create()) in the
original IBM import.

Instead, check the return codes to prevent the possibility of creating
malformed directories.

Change-Id: I60179488429dfa9afe60c4862c5e42b41f1e0048
Reviewed-on: https://gerrit.openafs.org/13800
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
Reviewed-by: Mark Vitale <mvitale@sinenomine.net>
Tested-by: BuildBot <buildbot@rampaginggeek.com>

diff --git a/src/dir/dir.c b/src/dir/dir.c
index eaacd32..0fb6bff 100644 (file)
--- a/src/dir/dir.c
+++ b/src/dir/dir.c
@@ -326,10 +326,17 @@ FreeBlobs(dir_file_t dir, int firstblob, int nblobs)
     DRelease(&pagehdbuf, 1);
 }
 
-/*
+/*!
  * Format an empty directory properly.  Note that the first 13 entries in a
  * directory header page are allocated, 1 to the page header, 4 to the
  * allocation map and 8 to the hash table.
+ *
+ * \param dir      pointer to the directory object
+ * \param me       fid (vnode+uniq) for new dir
+ * \param parent    fid (vnode+uniq) for parent dir
+ *
+ * \retval 0       success
+ * \retval nonzero  error code
  */
 int
 afs_dir_MakeDir(dir_file_t dir, afs_int32 * me, afs_int32 * parent)
@@ -337,6 +344,7 @@ afs_dir_MakeDir(dir_file_t dir, afs_int32 * me, afs_int32 * parent)
     int i;
     struct DirBuffer buffer;
     struct DirHeader *dhp;
+    int code;
 
     DNew(dir, 0, &buffer);
     dhp = (struct DirHeader *)buffer.data;
@@ -354,8 +362,12 @@ afs_dir_MakeDir(dir_file_t dir, afs_int32 * me, afs_int32 * parent)
     for (i = 0; i < NHASHENT; i++)
        dhp->hashTable[i] = 0;
     DRelease(&buffer, 1);
-    afs_dir_Create(dir, ".", me);
-    afs_dir_Create(dir, "..", parent); /* Virtue is its own .. */
+    code = afs_dir_Create(dir, ".", me);
+    if (code)
+       return code;
+    code = afs_dir_Create(dir, "..", parent);
+    if (code)
+       return code;
     return 0;
 }