From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
commit 8fafac202d18230bb9926bda48e563fd2cce2a4f 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: 5db4d286a8ef ("xen/pvcalls: implement connect command")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Reviewed-by: Juergen Gross <jgross@xxxxxxxx>
Link: https://lore.kernel.org/r/e5f98dc2-0305-491f-a860-71bbd1398a2f@kili.mountain
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/xen/pvcalls-back.c | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)
--- a/drivers/xen/pvcalls-back.c
+++ b/drivers/xen/pvcalls-back.c
@@ -321,8 +321,10 @@ static struct sock_mapping *pvcalls_new_
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 x
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++);
@@ -557,7 +557,6 @@ static void __pvcalls_back_accept(struct
sock);
if (!map) {
ret = -EFAULT;
- sock_release(sock);
goto out_error;
}
