From: Maurizio Lombardi <mlombard@redhat.com> To: martin.petersen@oracle.com Cc: linux-scsi@vger.kernel.org, target-devel@vger.kernel.org, bvanassche@acm.org, michael.christie@oracle.com Subject: [PATCH 1/2] target: iscsi: prevent a race condition in iscsit_unmap_cmd() Date: Wed, 07 Oct 2020 14:53:25 +0000 [thread overview] Message-ID: <20201007145326.56850-2-mlombard@redhat.com> (raw) In-Reply-To: <20201007145326.56850-1-mlombard@redhat.com> A potential race condition may occur in iscsit_unmap_cmd() if the __iscsit_free_cmd() function is called by two different threads. This patch adds a spinlock to serialize the calls to iscsit_unmap_cmd() Signed-off-by: Maurizio Lombardi <mlombard@redhat.com> --- drivers/target/iscsi/iscsi_target_login.c | 1 + drivers/target/iscsi/iscsi_target_util.c | 5 ++++- include/target/iscsi/iscsi_target_core.h | 1 + 3 files changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/target/iscsi/iscsi_target_login.c b/drivers/target/iscsi/iscsi_target_login.c index 893d1b406c29..e16ceee87bba 100644 --- a/drivers/target/iscsi/iscsi_target_login.c +++ b/drivers/target/iscsi/iscsi_target_login.c @@ -1110,6 +1110,7 @@ static struct iscsi_conn *iscsit_alloc_conn(struct iscsi_np *np) spin_lock_init(&conn->nopin_timer_lock); spin_lock_init(&conn->response_queue_lock); spin_lock_init(&conn->state_lock); + spin_lock_init(&conn->unmap_cmd_lock); timer_setup(&conn->nopin_response_timer, iscsit_handle_nopin_response_timeout, 0); diff --git a/drivers/target/iscsi/iscsi_target_util.c b/drivers/target/iscsi/iscsi_target_util.c index 45ba07c6ec27..3082f5bde9fa 100644 --- a/drivers/target/iscsi/iscsi_target_util.c +++ b/drivers/target/iscsi/iscsi_target_util.c @@ -755,8 +755,11 @@ void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool check_queues) iscsit_remove_cmd_from_response_queue(cmd, conn); } - if (conn && conn->conn_transport->iscsit_unmap_cmd) + if (conn && conn->conn_transport->iscsit_unmap_cmd) { + spin_lock(&conn->unmap_cmd_lock); conn->conn_transport->iscsit_unmap_cmd(conn, cmd); + spin_unlock(&conn->unmap_cmd_lock); + } } void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown) diff --git a/include/target/iscsi/iscsi_target_core.h b/include/target/iscsi/iscsi_target_core.h index 1eccb2ac7d02..ae7ac0134c8c 100644 --- a/include/target/iscsi/iscsi_target_core.h +++ b/include/target/iscsi/iscsi_target_core.h @@ -575,6 +575,7 @@ struct iscsi_conn { spinlock_t nopin_timer_lock; spinlock_t response_queue_lock; spinlock_t state_lock; + spinlock_t unmap_cmd_lock; /* libcrypto RX and TX contexts for crc32c */ struct ahash_request *conn_rx_hash; struct ahash_request *conn_tx_hash; -- 2.26.2
WARNING: multiple messages have this Message-ID (diff)
From: Maurizio Lombardi <mlombard@redhat.com> To: martin.petersen@oracle.com Cc: linux-scsi@vger.kernel.org, target-devel@vger.kernel.org, bvanassche@acm.org, michael.christie@oracle.com Subject: [PATCH 1/2] target: iscsi: prevent a race condition in iscsit_unmap_cmd() Date: Wed, 7 Oct 2020 16:53:25 +0200 [thread overview] Message-ID: <20201007145326.56850-2-mlombard@redhat.com> (raw) In-Reply-To: <20201007145326.56850-1-mlombard@redhat.com> A potential race condition may occur in iscsit_unmap_cmd() if the __iscsit_free_cmd() function is called by two different threads. This patch adds a spinlock to serialize the calls to iscsit_unmap_cmd() Signed-off-by: Maurizio Lombardi <mlombard@redhat.com> --- drivers/target/iscsi/iscsi_target_login.c | 1 + drivers/target/iscsi/iscsi_target_util.c | 5 ++++- include/target/iscsi/iscsi_target_core.h | 1 + 3 files changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/target/iscsi/iscsi_target_login.c b/drivers/target/iscsi/iscsi_target_login.c index 893d1b406c29..e16ceee87bba 100644 --- a/drivers/target/iscsi/iscsi_target_login.c +++ b/drivers/target/iscsi/iscsi_target_login.c @@ -1110,6 +1110,7 @@ static struct iscsi_conn *iscsit_alloc_conn(struct iscsi_np *np) spin_lock_init(&conn->nopin_timer_lock); spin_lock_init(&conn->response_queue_lock); spin_lock_init(&conn->state_lock); + spin_lock_init(&conn->unmap_cmd_lock); timer_setup(&conn->nopin_response_timer, iscsit_handle_nopin_response_timeout, 0); diff --git a/drivers/target/iscsi/iscsi_target_util.c b/drivers/target/iscsi/iscsi_target_util.c index 45ba07c6ec27..3082f5bde9fa 100644 --- a/drivers/target/iscsi/iscsi_target_util.c +++ b/drivers/target/iscsi/iscsi_target_util.c @@ -755,8 +755,11 @@ void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool check_queues) iscsit_remove_cmd_from_response_queue(cmd, conn); } - if (conn && conn->conn_transport->iscsit_unmap_cmd) + if (conn && conn->conn_transport->iscsit_unmap_cmd) { + spin_lock(&conn->unmap_cmd_lock); conn->conn_transport->iscsit_unmap_cmd(conn, cmd); + spin_unlock(&conn->unmap_cmd_lock); + } } void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown) diff --git a/include/target/iscsi/iscsi_target_core.h b/include/target/iscsi/iscsi_target_core.h index 1eccb2ac7d02..ae7ac0134c8c 100644 --- a/include/target/iscsi/iscsi_target_core.h +++ b/include/target/iscsi/iscsi_target_core.h @@ -575,6 +575,7 @@ struct iscsi_conn { spinlock_t nopin_timer_lock; spinlock_t response_queue_lock; spinlock_t state_lock; + spinlock_t unmap_cmd_lock; /* libcrypto RX and TX contexts for crc32c */ struct ahash_request *conn_rx_hash; struct ahash_request *conn_tx_hash; -- 2.26.2
next prev parent reply other threads:[~2020-10-07 14:53 UTC|newest] Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-10-07 14:53 [PATCH 0/2] fix race conditions with task aborts Maurizio Lombardi 2020-10-07 14:53 ` Maurizio Lombardi 2020-10-07 14:53 ` Maurizio Lombardi [this message] 2020-10-07 14:53 ` [PATCH 1/2] target: iscsi: prevent a race condition in iscsit_unmap_cmd() Maurizio Lombardi 2020-10-08 2:15 ` Bart Van Assche 2020-10-08 2:15 ` Bart Van Assche 2020-10-08 9:42 ` Maurizio Lombardi 2020-10-08 9:42 ` Maurizio Lombardi 2020-10-07 14:53 ` [PATCH 2/2] target: iscsi: fix a race condition when aborting a task Maurizio Lombardi 2020-10-07 14:53 ` Maurizio Lombardi 2020-10-22 2:42 ` Mike Christie 2020-10-22 2:42 ` Mike Christie 2020-10-27 13:49 ` Maurizio Lombardi 2020-10-27 13:49 ` Maurizio Lombardi 2020-10-27 17:54 ` Mike Christie 2020-10-27 17:54 ` Mike Christie 2020-10-27 20:03 ` Michael Christie 2020-10-27 20:03 ` Michael Christie 2020-10-28 17:09 ` Maurizio Lombardi 2020-10-28 17:09 ` Maurizio Lombardi 2020-10-28 20:37 ` Mike Christie 2020-10-28 20:37 ` Mike Christie 2020-11-10 21:29 ` Maurizio Lombardi 2020-11-10 21:29 ` Maurizio Lombardi 2020-11-10 23:08 ` Mike Christie 2020-11-10 23:08 ` Mike Christie 2020-11-11 2:16 ` Mike Christie 2020-11-11 2:16 ` Mike Christie 2020-11-11 14:58 ` Maurizio Lombardi 2020-11-11 14:58 ` Maurizio Lombardi 2020-11-11 15:37 ` Michael Christie 2020-11-11 15:37 ` Michael Christie 2020-11-11 15:48 ` Maurizio Lombardi 2020-11-11 15:48 ` Maurizio Lombardi
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