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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?GkqV9cxxC1T/MvqYoHAEd/faJQKBDkoByDKqPA8+VqqCreaoMpwd9ZluK9dh?= =?us-ascii?Q?Vtfma7BeDQmu434twndfSt0BV26l2IZBy2YDo4Kp0v317o47+uxj5zMEUa8P?= =?us-ascii?Q?HBFAKWkQ+Rq2o8j1nR3lth0G96p/qTsAbqoaAiKE0o/c7uxYvw1h7JFoQzJ0?= =?us-ascii?Q?sUGRugeoYKORVcZ5J+Rikc4nFnSPm8kHJF7BMWdfGlebWpX+K29TthBfpOR0?= =?us-ascii?Q?tijFsGWqecCB17QcRjA5E/xBHAG6Z5gGosyj1dO5fKfLKaVUzQ9TQmcWoe3X?= =?us-ascii?Q?+/Ktoj559DzgYSMfl09qXi/6/1m0+8Ar/fXhQDMgKBVf/FvgMFrwN0V/BKxH?= =?us-ascii?Q?wCdEonFNIizDA6f4oZ2zlVcHFhnPYzmgsoDtu4fl4f/TuVTaQMJc2LMSEgh4?= =?us-ascii?Q?k4Eh8yFG+8Dqfa6f5Ien7oX8OZnLJqtIJC238sGGUQgF9JD9H8Na4pJAH9X6?= =?us-ascii?Q?pgPSpQzi8uvbbaMOsxdvNWQjP5oKbjTbRYwCbXm0eh8Vqqq5PFXCRoz5CRsx?= =?us-ascii?Q?WvLlQ9twa0MzTePUz6bBRUcpQndQ+g8TYkGgxoGushcIKJEazf+LqA7AdTcp?= =?us-ascii?Q?33NIWmvZIlvmEPWW1LOSvSdIJY8YqYAzXth4QWWaZqodg7G/9p7/dA9DvWNM?= =?us-ascii?Q?0/jQWvO2jenoX9K5dkrpm9Vke/Mfd3nqlmOu75P1uqBg9OogTZzNd22Njz4q?= =?us-ascii?Q?CkeB6qiGWt4CPAqUzbxpN3KkSWafvfB7qDkQgrIdMEStW70qJvIzX6VUBTQd?= =?us-ascii?Q?HYGN0BOwcc24D0B3yACYxzLGu9FhQd9ofSwM3LMQzjYKP1giVmEgeGv+sowY?= =?us-ascii?Q?T4nNB9couvBF6C+7I7IblOzFz3MlyYrdTvIrJCKxrQCqhtF0tF2I2Km+bcMU?= =?us-ascii?Q?J5ER1585oPePqbOr3KVisbonj3CSrZlCQ5yJQ2ZUySJac6kXez7U19QhjYJO?= =?us-ascii?Q?1ODoV83a7lUCLsjJ7xPodl//P26IT8lQGeCft2KuYsm1g44X7xgowp3eXvzq?= =?us-ascii?Q?4CeQZZr56rzXcWI0+We41XMPqo3NuGFrKYsl7Ub6C8/1lDRlZM/QaNvMhzut?= =?us-ascii?Q?aUJnsZzvNOhpDL59FX4T6J1BbH5SP83C/qmLYBvcmQZ0p0k/cvpSiG2HT3wA?= =?us-ascii?Q?0qiM9WuxaDSF5mbcRr/ENjLN9R9u+CdkUQ1KkKhVepgR95xxm3ulcG8fSUCh?= =?us-ascii?Q?ViTP9KaQUhy0vNaV5wfM+0HQusgWr8E6xfkq6McysV8jLZMBKCMXsYYRa0VY?= =?us-ascii?Q?0TFblQjMDzCee2vOD8vtkJuHZIFwm6LBjqwrr52K4Ew3YO07oq1z+E/I0lNz?= =?us-ascii?Q?fcm9tLmnu22KmBQE3wxZs2DFs/+AUZDcyNT1nD/4NapTip3qBZRXFBhpMt22?= =?us-ascii?Q?hJVEsDpIA23o4ZSUDGVUcYdHArrnQG0SWO+oRD6Ohm9Jgb3ERBzn3b5loRtA?= =?us-ascii?Q?yOFKkGAPlqqZx4qay3qIIYlwubVNrpBzzXCDskNN5vDbKafAqMf0GzYkReQY?= =?us-ascii?Q?HRvIIfQYKtHeQIycVViOHogkl90+uMB6pjMVhHoKRZ6qGuuKYbWvivnVmccj?= =?us-ascii?Q?FnhmXzqXIk/UTnpc0XOnN/Dhq8CW0/gbpoRkmIqdACLZuMmjY4pEWe+HgBZf?= =?us-ascii?Q?s1gMARjU5THtvkOyI+IIg8zChZ7HIuSB2DK5oho7UgJs?= X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 00f74a72-911f-414c-a920-08dabbaf4039 X-MS-Exchange-CrossTenant-AuthSource: BL0PR2101MB1092.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Nov 2022 02:17:39.9881 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: DyOCrVmDwioPaMQc04WIdXDBVKCkzn70D/fmHL9eS8LFxgLhg61fbVEPmpUDr/nE0ylhEGBDqirXItWLFuwNHw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR21MB3140 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Currently vsock_connectible_has_data() may miss a wakeup operation between vsock_connectible_has_data() == 0 and the prepare_to_wait(). Fix the race by adding the process to the wait queue before checking vsock_connectible_has_data(). Fixes: b3f7fd54881b ("af_vsock: separate wait data loop") Signed-off-by: Dexuan Cui --- Changes in v2 (Thanks Stefano!): Fixed a typo in the commit message. Removed the unnecessary finish_wait() at the end of the loop. net/vmw_vsock/af_vsock.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c index d258fd43092e..884eca7f6743 100644 --- a/net/vmw_vsock/af_vsock.c +++ b/net/vmw_vsock/af_vsock.c @@ -1905,8 +1905,11 @@ static int vsock_connectible_wait_data(struct sock *sk, err = 0; transport = vsk->transport; - while ((data = vsock_connectible_has_data(vsk)) == 0) { + while (1) { prepare_to_wait(sk_sleep(sk), wait, TASK_INTERRUPTIBLE); + data = vsock_connectible_has_data(vsk); + if (data != 0) + break; if (sk->sk_err != 0 || (sk->sk_shutdown & RCV_SHUTDOWN) || -- 2.25.1