From: Nicholas Bellinger Date: Tue, 19 May 2015 22:10:44 +0000 (-0700) Subject: target: Drop signal_pending checks after interruptible lock acquire X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=ee7619f2eb21304dcc846b8dc8f8c3d6cbe11792;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git target: Drop signal_pending checks after interruptible lock acquire Once upon a time, iscsit_get_tpg() was using an un-interruptible lock. The signal_pending() usage was a check to allow userspace to break out of the operation with SIGINT. AFAICT, there's no reason why this is necessary anymore, and as reported by Alexey can be potentially dangerous. Also, go ahead and drop the other two problematic cases within iscsit_access_np() and sbc_compare_and_write() as well. Found by Linux Driver Verification project (linuxtesting.org). Reported-by: Alexey Khoroshilov Signed-off-by: Nicholas Bellinger --- diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c index 34871a628b11..74e6114ff18f 100644 --- a/drivers/target/iscsi/iscsi_target.c +++ b/drivers/target/iscsi/iscsi_target.c @@ -230,7 +230,7 @@ int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg) * Here we serialize access across the TIQN+TPG Tuple. */ ret = down_interruptible(&tpg->np_login_sem); - if ((ret != 0) || signal_pending(current)) + if (ret != 0) return -1; spin_lock_bh(&tpg->tpg_state_lock); diff --git a/drivers/target/iscsi/iscsi_target_tpg.c b/drivers/target/iscsi/iscsi_target_tpg.c index e8a240818353..5e3295fe404d 100644 --- a/drivers/target/iscsi/iscsi_target_tpg.c +++ b/drivers/target/iscsi/iscsi_target_tpg.c @@ -161,10 +161,7 @@ struct iscsi_portal_group *iscsit_get_tpg_from_np( int iscsit_get_tpg( struct iscsi_portal_group *tpg) { - int ret; - - ret = mutex_lock_interruptible(&tpg->tpg_access_lock); - return ((ret != 0) || signal_pending(current)) ? -1 : 0; + return mutex_lock_interruptible(&tpg->tpg_access_lock); } void iscsit_put_tpg(struct iscsi_portal_group *tpg) diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c index 8855781ac653..733824e3825f 100644 --- a/drivers/target/target_core_sbc.c +++ b/drivers/target/target_core_sbc.c @@ -568,7 +568,7 @@ sbc_compare_and_write(struct se_cmd *cmd) * comparision using SGLs at cmd->t_bidi_data_sg.. */ rc = down_interruptible(&dev->caw_sem); - if ((rc != 0) || signal_pending(current)) { + if (rc != 0) { cmd->transport_complete_callback = NULL; return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; }