commit a053958f073740219df1da596b42bfefdab634c4
author Ingo Molnar <mingo@elte.hu> Tue Apr 07 13:40:49 2009 +0200
committer Ingo Molnar <mingo@elte.hu> Tue Apr 07 13:40:55 2009 +0200
tree f681f808db3d5df5d7987199c8224031982bcf3f
parent 4fafd5b03875612a24a5b17dac0c63217a65de42
parent e2494e1b42ebac402324105d57646489d19e2b01

Merge branch 'tracing/blktrace-fixes' into tracing/urgent

Merge reason: this used to be a tracing/blktrace-v2 devel topic still
              cooking during the merge window - has propagated to fixes

Signed-off-by: Ingo Molnar <mingo@elte.hu>

block/blk-core.c

diff --git a/block/blk-core.c b/block/blk-core.c
index 29bcfac..859879d 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -132,6 +132,7 @@
 	INIT_HLIST_NODE(&rq->hash);
 	RB_CLEAR_NODE(&rq->rb_node);
 	rq->cmd = rq->__cmd;
+	rq->cmd_len = BLK_MAX_CDB;
 	rq->tag = -1;
 	rq->ref_count = 1;
 }

kernel/trace/blktrace.c

diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 947c5b3..b32ff44 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -327,10 +327,10 @@
 	char *msg;
 	struct blk_trace *bt;
 
-	if (count > BLK_TN_MAX_MSG)
+	if (count >= BLK_TN_MAX_MSG)
 		return -EINVAL;
 
-	msg = kmalloc(count, GFP_KERNEL);
+	msg = kmalloc(count + 1, GFP_KERNEL);
 	if (msg == NULL)
 		return -ENOMEM;
 
@@ -339,6 +339,7 @@
 		return -EFAULT;
 	}
 
+	msg[count] = '\0';
 	bt = filp->private_data;
 	__trace_note_message(bt, "%s", msg);
 	kfree(msg);
@@ -642,7 +643,7 @@
 	if (blk_pc_request(rq)) {
 		what |= BLK_TC_ACT(BLK_TC_PC);
 		__blk_add_trace(bt, 0, rq->data_len, rw, what, rq->errors,
-				sizeof(rq->cmd), rq->cmd);
+				rq->cmd_len, rq->cmd);
 	} else  {
 		what |= BLK_TC_ACT(BLK_TC_FS);
 		__blk_add_trace(bt, rq->hard_sector, rq->hard_nr_sectors << 9,