This is a note to let you know that I've just added the patch titled
SUNRPC: Fix general protection fault in trace_rpc_xdr_overflow()
to the 5.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
sunrpc-fix-general-protection-fault-in-trace_rpc_xdr.patch
and it can be found in the queue-5.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit b4e7cc0f6944081bfab85f7fc33b7a66a48deefc
Author: Chuck Lever <chuck.lever@xxxxxxxxxx>
Date: Fri Oct 23 10:41:07 2020 -0400
SUNRPC: Fix general protection fault in trace_rpc_xdr_overflow()
[ Upstream commit d321ff589c16d8c2207485a6d7fbdb14e873d46e ]
The TP_fast_assign() section is careful enough not to dereference
xdr->rqst if it's NULL. The TP_STRUCT__entry section is not.
Fixes: 5582863f450c ("SUNRPC: Add XDR overflow trace event")
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
Signed-off-by: J. Bruce Fields <bfields@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/include/trace/events/sunrpc.h b/include/trace/events/sunrpc.h
index 65d7dfbbc9cd7..ca2f27b9f919d 100644
--- a/include/trace/events/sunrpc.h
+++ b/include/trace/events/sunrpc.h
@@ -607,10 +607,10 @@ TRACE_EVENT(rpc_xdr_overflow,
__field(size_t, tail_len)
__field(unsigned int, page_len)
__field(unsigned int, len)
- __string(progname,
- xdr->rqst->rq_task->tk_client->cl_program->name)
- __string(procedure,
- xdr->rqst->rq_task->tk_msg.rpc_proc->p_name)
+ __string(progname, xdr->rqst ?
+ xdr->rqst->rq_task->tk_client->cl_program->name : "unknown")
+ __string(procedure, xdr->rqst ?
+ xdr->rqst->rq_task->tk_msg.rpc_proc->p_name : "unknown")
),
TP_fast_assign(
