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xen/pvcalls-back: fix double frees with pvcalls_new_active_socket()

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commit 8fafac202d upstream.

In the pvcalls_new_active_socket() function, most error paths call
pvcalls_back_release_active(fedata->dev, fedata, map) which calls
sock_release() on "sock".  The bug is that the caller also frees sock.

Fix this by making every error path in pvcalls_new_active_socket()
release the sock, and don't free it in the caller.

Fixes: 5db4d286a8 ("xen/pvcalls: implement connect command")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/e5f98dc2-0305-491f-a860-71bbd1398a2f@kili.mountain
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dan Carpenter 2023-05-03 18:11:35 +03:00 • committed by Justin Hammond
parent 8b4ab41c80
commit 3938c05686
1 changed files with 4 additions and 5 deletions
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9
drivers/xen/pvcalls-back.c
View file

@ -321,8 +321,10 @@ static struct sock_mapping *pvcalls_new_active_socket(
void *page;
map = kzalloc(sizeof(*map), GFP_KERNEL);
if (map == NULL)
if (map == NULL) {
sock_release(sock);
return NULL;
}
map->fedata = fedata;
map->sock = sock;
@ -414,10 +416,8 @@ static int pvcalls_back_connect(struct xenbus_device *dev,
req->u.connect.ref,
req->u.connect.evtchn,
sock);
if (!map) {
if (!map)
ret = -EFAULT;
sock_release(sock);
}
out:
rsp = RING_GET_RESPONSE(&fedata->ring, fedata->ring.rsp_prod_pvt++);
@ -558,7 +558,6 @@ static void __pvcalls_back_accept(struct work_struct *work)
sock);
if (!map) {
ret = -EFAULT;
sock_release(sock);
goto out_error;
}