afs: Fix warning due to unadvanced marshalling pointer

[ Upstream commit c80afa1d9c3603d5eddeb8d63368823b1982f3f0 ]

When using the afs.yfs.acl xattr to change an AuriStor ACL, a warning
can be generated when the request is marshalled because the buffer
pointer isn't increased after adding the last element, thereby
triggering the check at the end if the ACL wasn't empty.  This just
causes something like the following warning, but doesn't stop the call
from happening successfully:

    kAFS: YFS.StoreOpaqueACL2: Request buffer underflow (36<108)

Fix this simply by increasing the count prior to the check.

Fixes: f5e4546347bc ("afs: Implement YFS ACL setting")
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/afs/yfsclient.c b/fs/afs/yfsclient.c
index d21cf61d86b9f5b550178f553fbea7c319b179be..3b19b009452a23bcebbce25e4c1bf66aa49b777c 100644 (file)
--- a/fs/afs/yfsclient.c
+++ b/fs/afs/yfsclient.c
@@ -2162,6 +2162,7 @@ int yfs_fs_store_opaque_acl2(struct afs_fs_cursor *fc, const struct afs_acl *acl
        memcpy(bp, acl->data, acl->size);
        if (acl->size != size)
                memset((void *)bp + acl->size, 0, size - acl->size);
+       bp += size / sizeof(__be32);
        yfs_check_req(call, bp);
 
        trace_afs_make_fs_call(call, &vnode->fid);