From: Maurizio Lombardi <mlombard@xxxxxxxxxx>
[ Upstream commit 926245c7d22271307606c88b1fbb2539a8550e94 ]
page_frag_free() won't completely release the memory
allocated for the commands, the cache page must be explicitly
freed by calling __page_frag_cache_drain().
This bug can be easily reproduced by repeatedly
executing the following command on the initiator:
$echo 1 > /sys/devices/virtual/nvme-fabrics/ctl/nvme0/reset_controller
Signed-off-by: Maurizio Lombardi <mlombard@xxxxxxxxxx>
Reviewed-by: Sagi Grimberg <sagi@xxxxxxxxxxx>
Reviewed-by: John Meneghini <jmeneghi@xxxxxxxxxx>
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/nvme/target/tcp.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/nvme/target/tcp.c b/drivers/nvme/target/tcp.c
index 5266d534c4b31..b4ef7e9e8461f 100644
--- a/drivers/nvme/target/tcp.c
+++ b/drivers/nvme/target/tcp.c
@@ -1398,6 +1398,7 @@ static void nvmet_tcp_uninit_data_in_cmds(struct nvmet_tcp_queue *queue)
static void nvmet_tcp_release_queue_work(struct work_struct *w)
{
+ struct page *page;
struct nvmet_tcp_queue *queue =
container_of(w, struct nvmet_tcp_queue, release_work);
@@ -1417,6 +1418,8 @@ static void nvmet_tcp_release_queue_work(struct work_struct *w)
nvmet_tcp_free_crypto(queue);
ida_simple_remove(&nvmet_tcp_queue_ida, queue->idx);
+ page = virt_to_head_page(queue->pf_cache.va);
+ __page_frag_cache_drain(page, queue->pf_cache.pagecnt_bias);
kfree(queue);
}
--
2.33.0
