This is a note to let you know that I've just added the patch titled afs: Fix warning due to unadvanced marshalling pointer to the 5.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: afs-fix-warning-due-to-unadvanced-marshalling-pointe.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 6a1cdf298ca7e03f036321ffc8debb13eacdc317 Author: David Howells <dhowells@xxxxxxxxxx> Date: Tue Nov 3 16:32:58 2020 +0000 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@xxxxxxxxxx> Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/fs/afs/yfsclient.c b/fs/afs/yfsclient.c index d21cf61d86b9f..3b19b009452a2 100644 --- 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);