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afs: Fix warning due to unadvanced marshalling pointer 

[ Upstream commit c80afa1d9c ]

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: f5e4546347 ("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>
This commit is contained in:
David Howells 2020-11-03 16:32:58 +00:00 committed by Greg Kroah-Hartman
parent 9946509a02
commit e201588fad
1 changed files with 1 additions and 0 deletions
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1
fs/afs/yfsclient.c
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@ -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);