Re: [PATCH] smb: client: Fix error cleanup in smb_extract_iter_to_rdma()

[Greg KH <gregkh@linuxfoundation.org>]

On Fri, Apr 24, 2026 at 10:56:11AM +0100, David Howells wrote:
>     
> Fix smb_extract_iter_to_rdma() to use pre-decrement, not post-decrement, so
> that it cleans up the correct slots.
> 
> Fixes: e5fbdde43017 ("cifs: Add a function to build an RDMA SGE list from an iterator")
> Closes: https://sashiko.dev/#/patchset/20260326104544.509518-1-dhowells%40redhat.com
> Signed-off-by: David Howells <dhowells@redhat.com>
> cc: Steve French <sfrench@samba.org>
> cc: Stefan Metzmacher <metze@samba.org>
> cc: Paulo Alcantara <pc@manguebit.org>
> cc: Tom Talpey <tom@talpey.com>
> cc: linux-cifs@vger.kernel.org
> cc: linux-fsdevel@vger.kernel.org
> ---
>  fs/smb/client/smbdirect.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/smb/client/smbdirect.c b/fs/smb/client/smbdirect.c
> index 7d5f66bdbb30..4978755c035c 100644
> --- a/fs/smb/client/smbdirect.c
> +++ b/fs/smb/client/smbdirect.c
> @@ -3394,7 +3394,7 @@ static ssize_t smb_extract_iter_to_rdma(struct iov_iter *iter, size_t len,
>  
>  	if (ret < 0) {
>  		while (rdma->nr_sge > before) {
> -			struct ib_sge *sge = &rdma->sge[rdma->nr_sge--];
> +			struct ib_sge *sge = &rdma->sge[--rdma->nr_sge];
>  
>  			ib_dma_unmap_single(rdma->device, sge->addr, sge->length,
>  					    rdma->direction);
> 
> 
<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>