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rxrpc, afs: Fix missing error pointer check after rxrpc_kernel_lookup_peer()

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rxrpc_kernel_lookup_peer() can also return error pointers in addition to
NULL, so just checking for NULL is not sufficient.

Fix this by:

 (1) Changing rxrpc_kernel_lookup_peer() to return -ENOMEM rather than NULL
     on allocation failure.

 (2) Making the callers in afs use IS_ERR() and PTR_ERR() to pass on the
     error code returned.

Fixes: 72904d7b9b ("rxrpc, afs: Allow afs to pin rxrpc_peer objects")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Co-developed-by: David Howells <dhowells@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: Simon Horman <horms@kernel.org>
cc: linux-afs@lists.infradead.org
Link: https://patch.msgid.link/368272.1772713861@warthog.procyon.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Miaoqian Lin
2026-03-05 12:31:01 +00:00
committed by Jakub Kicinski
parent 7a4d74676c
commit 4245a79003
2 changed files with 9 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
fs/afs/addr_list.c
View File

@@ -298,8 +298,8 @@ int afs_merge_fs_addr4(struct afs_net *net, struct afs_addr_list *alist,
srx.transport.sin.sin_addr.s_addr = xdr;
peer = rxrpc_kernel_lookup_peer(net->socket, &srx, GFP_KERNEL);
if (!peer)
return -ENOMEM;
if (IS_ERR(peer))
return PTR_ERR(peer);
for (i = 0; i < alist->nr_ipv4; i++) {
if (peer == alist->addrs[i].peer) {
@@ -342,8 +342,8 @@ int afs_merge_fs_addr6(struct afs_net *net, struct afs_addr_list *alist,
memcpy(&srx.transport.sin6.sin6_addr, xdr, 16);
peer = rxrpc_kernel_lookup_peer(net->socket, &srx, GFP_KERNEL);
if (!peer)
return -ENOMEM;
if (IS_ERR(peer))
return PTR_ERR(peer);
for (i = alist->nr_ipv4; i < alist->nr_addrs; i++) {
if (peer == alist->addrs[i].peer) {

8
net/rxrpc/af_rxrpc.c
View File

@@ -267,12 +267,13 @@ static int rxrpc_listen(struct socket *sock, int backlog)
* Lookup or create a remote transport endpoint record for the specified
* address.
*
* Return: The peer record found with a reference, %NULL if no record is found
* or a negative error code if the address is invalid or unsupported.
* Return: The peer record found with a reference or a negative error code if
* the address is invalid or unsupported.
*/
struct rxrpc_peer *rxrpc_kernel_lookup_peer(struct socket *sock,
struct sockaddr_rxrpc *srx, gfp_t gfp)
{
struct rxrpc_peer *peer;
struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
int ret;
@@ -280,7 +281,8 @@ struct rxrpc_peer *rxrpc_kernel_lookup_peer(struct socket *sock,
if (ret < 0)
return ERR_PTR(ret);
return rxrpc_lookup_peer(rx->local, srx, gfp);
peer = rxrpc_lookup_peer(rx->local, srx, gfp);
return peer ?: ERR_PTR(-ENOMEM);
}
EXPORT_SYMBOL(rxrpc_kernel_lookup_peer);