From patchwork Wed Dec 5 22:30:11 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [3.5.y.z, extended, stable] Patch "target: Fix double-free of se_cmd in" has been added to staging queue Date: Wed, 05 Dec 2012 12:30:11 -0000 From: Herton Ronaldo Krzesinski X-Patchwork-Id: 203996 Message-Id: <1354746611-21190-1-git-send-email-herton.krzesinski@canonical.com> To: Nicholas Bellinger Cc: Roland Dreier , kernel-team@lists.ubuntu.com, Andy Grover , Christoph Hellwig This is a note to let you know that I have just added a patch titled target: Fix double-free of se_cmd in to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree which can be found at: http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue If you, or anyone else, feels it should not be added to this tree, please reply to this email. For more information about the 3.5.y.z tree, see https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable Thanks. -Herton ------ >From 72fcf3099d5595243143c3969f7728266fdc3167 Mon Sep 17 00:00:00 2001 From: Nicholas Bellinger Date: Fri, 26 Oct 2012 15:35:45 -0700 Subject: [PATCH] target: Fix double-free of se_cmd in target_complete_tmr_failure X-Extended-Stable: 3.5 commit e13d5fef88c40b87c8430f8274c3a9ca32ef90bc upstream. Fabric drivers currently expect to internally release se_cmd in the event of a TMR failure during target_submit_tmr(), which means the immediate call to transport_generic_free_cmd() after TFO->queue_tm_rsp() from within target_complete_tmr_failure() workqueue context is wrong. This is done as some fabrics expect TMR operations to be acknowledged before releasing the descriptor, so the assumption that core is releasing se_cmd associated TMR memory is incorrect. This fixes a OOPs where transport_generic_free_cmd() was being called more than once. This bug was originally observed with tcm_qla2xxx fabric ports. Cc: Christoph Hellwig Cc: Roland Dreier Cc: Andy Grover Signed-off-by: Nicholas Bellinger Signed-off-by: Herton Ronaldo Krzesinski --- drivers/target/target_core_transport.c | 1 - 1 file changed, 1 deletion(-) -- 1.7.9.5 diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index 0981707..7879ff4 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -1617,7 +1617,6 @@ static void target_complete_tmr_failure(struct work_struct *work) se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST; se_cmd->se_tfo->queue_tm_rsp(se_cmd); - transport_generic_free_cmd(se_cmd, 0); } /**