jfs: Fix inconsistency between memory allocation and ea_buf->max_size

The code is assuming the buffer is max_size length, but we weren't
allocating enough space for it.

Signed-off-by: Shankara Pailoor <shankarapailoor@gmail.com>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>

1 files changed, 6 insertions, 4 deletions

diff --git a/fs/jfs/xattr.c b/fs/jfs/xattr.c
index c60f3d32ee91..a6797986b625 100644
--- a/fs/jfs/xattr.c
+++ b/fs/jfs/xattr.c
@@ -491,15 +491,17 @@ static int ea_get(struct inode *inode, struct ea_buffer *ea_buf, int min_size)
         if (size > PSIZE) {
                 /*
                  * To keep the rest of the code simple.  Allocate a
-                 * contiguous buffer to work with
+                 * contiguous buffer to work with. Make the buffer large
+                 * enough to make use of the whole extent.
                  */
-                ea_buf->xattr = kmalloc(size, GFP_KERNEL);
+                ea_buf->max_size = (size + sb->s_blocksize - 1) &
+                    ~(sb->s_blocksize - 1);
+
+                ea_buf->xattr = kmalloc(ea_buf->max_size, GFP_KERNEL);
                 if (ea_buf->xattr == NULL)
                         return -ENOMEM;
 
                 ea_buf->flag = EA_MALLOC;
-                ea_buf->max_size = (size + sb->s_blocksize - 1) &
-                    ~(sb->s_blocksize - 1);
 
                 if (ea_size == 0)
                         return 0;