diff options
| author | Dexuan Cui <decui@microsoft.com> | 2018-11-26 02:29:56 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-11-26 20:33:56 +0100 |
| commit | eceb05965489784f24bbf4d61ba60e475a983016 (patch) | |
| tree | b982e4364053c46e055cbff669fd876ebf168f46 /drivers | |
| parent | 7bada55ab50697861eee6bb7d60b41e68a961a9c (diff) | |
| download | lwn-eceb05965489784f24bbf4d61ba60e475a983016.tar.gz lwn-eceb05965489784f24bbf4d61ba60e475a983016.zip | |
Drivers: hv: vmbus: check the creation_status in vmbus_establish_gpadl()
This is a longstanding issue: if the vmbus upper-layer drivers try to
consume too many GPADLs, the host may return with an error
0xC0000044 (STATUS_QUOTA_EXCEEDED), but currently we forget to check
the creation_status, and hence we can pass an invalid GPADL handle
into the OPEN_CHANNEL message, and get an error code 0xc0000225 in
open_info->response.open_result.status, and finally we hang in
vmbus_open() -> "goto error_free_info" -> vmbus_teardown_gpadl().
With this patch, we can exit gracefully on STATUS_QUOTA_EXCEEDED.
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: stable@vger.kernel.org
Signed-off-by: Dexuan Cui <decui@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/hv/channel.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c index de8193f3b838..fe00b12e4417 100644 --- a/drivers/hv/channel.c +++ b/drivers/hv/channel.c @@ -516,6 +516,14 @@ int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer, } wait_for_completion(&msginfo->waitevent); + if (msginfo->response.gpadl_created.creation_status != 0) { + pr_err("Failed to establish GPADL: err = 0x%x\n", + msginfo->response.gpadl_created.creation_status); + + ret = -EDQUOT; + goto cleanup; + } + if (channel->rescind) { ret = -ENODEV; goto cleanup; |