[hurd] 08/21: ext2fs: Fix block allocation.

[Samuel Thibault]

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sthibault pushed a commit to branch upstream
in repository hurd.

commit 4490e9a08367c7af617358de5b85ae7ab5198278
Author: Justus Winter <address@hidden>
Date:   Sat Oct 8 18:25:13 2016 +0200

    ext2fs: Fix block allocation.
    
    * ext2fs/xattr.c (ext2_set_xattr): Check returned block number before
    mapping it.
---
 ext2fs/xattr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ext2fs/xattr.c b/ext2fs/xattr.c
index 41e8c89..c5771fe 100644
--- a/ext2fs/xattr.c
+++ b/ext2fs/xattr.c
@@ -704,7 +704,6 @@ ext2_set_xattr (struct node *np, const char *name, const 
char *value,
       goal = sblock->s_first_data_block + np->dn->info.i_block_group *
        EXT2_BLOCKS_PER_GROUP (sblock);
       blkno = ext2_new_block (goal, 0, 0, 0);
-      block = disk_cache_block_ref (blkno);
 
       if (blkno == 0)
        {
@@ -712,6 +711,7 @@ ext2_set_xattr (struct node *np, const char *name, const 
char *value,
          goto cleanup;
        }
 
+      block = disk_cache_block_ref (blkno);
       memset (block, 0, block_size);
 
       header = EXT2_XATTR_HEADER (block);

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