Patch "xsk: recycle buffer in case Rx queue was full" has been added to the 6.6-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    xsk: recycle buffer in case Rx queue was full

to the 6.6-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:
     xsk-recycle-buffer-in-case-rx-queue-was-full.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 3a23678456ba4de3d40da0dbc139590cb5a1c647
Author: Maciej Fijalkowski <maciej.fijalkowski@xxxxxxxxx>
Date:   Wed Jan 24 20:15:52 2024 +0100

    xsk: recycle buffer in case Rx queue was full
    
    [ Upstream commit 269009893146c495f41e9572dd9319e787c2eba9 ]
    
    Add missing xsk_buff_free() call when __xsk_rcv_zc() failed to produce
    descriptor to XSK Rx queue.
    
    Fixes: 24ea50127ecf ("xsk: support mbuf on ZC RX")
    Acked-by: Magnus Karlsson <magnus.karlsson@xxxxxxxxx>
    Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@xxxxxxxxx>
    Link: https://lore.kernel.org/r/20240124191602.566724-2-maciej.fijalkowski@xxxxxxxxx
    Signed-off-by: Alexei Starovoitov <ast@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
index 774a6d1916e4..d849dc04a334 100644
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -166,8 +166,10 @@ static int xsk_rcv_zc(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len)
 		contd = XDP_PKT_CONTD;
 
 	err = __xsk_rcv_zc(xs, xskb, len, contd);
-	if (err || likely(!frags))
-		goto out;
+	if (err)
+		goto err;
+	if (likely(!frags))
+		return 0;
 
 	xskb_list = &xskb->pool->xskb_list;
 	list_for_each_entry_safe(pos, tmp, xskb_list, xskb_list_node) {
@@ -176,11 +178,13 @@ static int xsk_rcv_zc(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len)
 		len = pos->xdp.data_end - pos->xdp.data;
 		err = __xsk_rcv_zc(xs, pos, len, contd);
 		if (err)
-			return err;
+			goto err;
 		list_del(&pos->xskb_list_node);
 	}
 
-out:
+	return 0;
+err:
+	xsk_buff_free(xdp);
 	return err;
 }