Commit d42f9c74 authored by Arnd Bergmann's avatar Arnd Bergmann Committed by Greg Kroah-Hartman

staging: lustre: ko2iblnd: check copy_from_iter/copy_to_iter return code

commit 566e1ce2 upstream.

We now get a helpful warning for code that calls copy_{from,to}_iter
without checking the return value, introduced by commit aa28de27
("iov_iter/hardening: move object size checks to inlined part").

drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c: In function 'kiblnd_send':
drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c:1643:2: error: ignoring return value of 'copy_from_iter', declared with attribute warn_unused_result [-Werror=unused-result]
drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c: In function 'kiblnd_recv':
drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c:1744:3: error: ignoring return value of 'copy_to_iter', declared with attribute warn_unused_result [-Werror=unused-result]

In case we get short copies here, we may get incorrect behavior.
I've added failure handling for both rx and tx now, returning
-EFAULT as expected.
Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
Signed-off-by: default avatarJames Simmons <jsimmons@infradead.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 85643f6f
......@@ -1650,8 +1650,13 @@ kiblnd_send(lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg)
ibmsg = tx->tx_msg;
ibmsg->ibm_u.immediate.ibim_hdr = *hdr;
copy_from_iter(&ibmsg->ibm_u.immediate.ibim_payload, IBLND_MSG_SIZE,
rc = copy_from_iter(&ibmsg->ibm_u.immediate.ibim_payload, payload_nob,
&from);
if (rc != payload_nob) {
kiblnd_pool_free_node(&tx->tx_pool->tpo_pool, &tx->tx_list);
return -EFAULT;
}
nob = offsetof(struct kib_immediate_msg, ibim_payload[payload_nob]);
kiblnd_init_tx_msg(ni, tx, IBLND_MSG_IMMEDIATE, nob);
......@@ -1751,8 +1756,14 @@ kiblnd_recv(lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg, int delayed,
break;
}
copy_to_iter(&rxmsg->ibm_u.immediate.ibim_payload,
IBLND_MSG_SIZE, to);
rc = copy_to_iter(&rxmsg->ibm_u.immediate.ibim_payload, rlen,
to);
if (rc != rlen) {
rc = -EFAULT;
break;
}
rc = 0;
lnet_finalize(ni, lntmsg, 0);
break;
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment