linux-kernel - FAILED: Patch "mei: use kvmalloc for read buffer" failed to apply to v4.19-stable tree

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Message-ID: <20241106021437.184398-1-sashal@kernel.org>
Date: Tue,  5 Nov 2024 21:14:36 -0500
From: Sasha Levin <sashal@...nel.org>
To: stable@...r.kernel.org,
	alexander.usyskin@...el.com
Cc: stable <stable@...nel.org>,
	Rohit Agarwal <rohiagar@...omium.org>,
	Brian Geffon <bgeffon@...gle.com>,
	Tomas Winkler <tomasw@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org
Subject: FAILED: Patch "mei: use kvmalloc for read buffer" failed to apply to v4.19-stable tree

The patch below does not apply to the v4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@...r.kernel.org>.

Thanks,
Sasha

------------------ original commit in Linus's tree ------------------

>From 4adf613e01bf99e1739f6ff3e162ad5b7d578d1a Mon Sep 17 00:00:00 2001
From: Alexander Usyskin <alexander.usyskin@...el.com>
Date: Tue, 15 Oct 2024 15:31:57 +0300
Subject: [PATCH] mei: use kvmalloc for read buffer

Read buffer is allocated according to max message size, reported by
the firmware and may reach 64K in systems with pxp client.
Contiguous 64k allocation may fail under memory pressure.
Read buffer is used as in-driver message storage and not required
to be contiguous.
Use kvmalloc to allow kernel to allocate non-contiguous memory.

Fixes: 3030dc056459 ("mei: add wrapper for queuing control commands.")
Cc: stable <stable@...nel.org>
Reported-by: Rohit Agarwal <rohiagar@...omium.org>
Closes: https://lore.kernel.org/all/20240813084542.2921300-1-rohiagar@chromium.org/
Tested-by: Brian Geffon <bgeffon@...gle.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@...el.com>
Acked-by: Tomas Winkler <tomasw@...il.com>
Link: https://lore.kernel.org/r/20241015123157.2337026-1-alexander.usyskin@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/misc/mei/client.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c
index 9d090fa07516f..be011cef12e5d 100644
--- a/drivers/misc/mei/client.c
+++ b/drivers/misc/mei/client.c
@@ -321,7 +321,7 @@ void mei_io_cb_free(struct mei_cl_cb *cb)
 		return;
 
 	list_del(&cb->list);
-	kfree(cb->buf.data);
+	kvfree(cb->buf.data);
 	kfree(cb->ext_hdr);
 	kfree(cb);
 }
@@ -497,7 +497,7 @@ struct mei_cl_cb *mei_cl_alloc_cb(struct mei_cl *cl, size_t length,
 	if (length == 0)
 		return cb;
 
-	cb->buf.data = kmalloc(roundup(length, MEI_SLOT_SIZE), GFP_KERNEL);
+	cb->buf.data = kvmalloc(roundup(length, MEI_SLOT_SIZE), GFP_KERNEL);
 	if (!cb->buf.data) {
 		mei_io_cb_free(cb);
 		return NULL;
-- 
2.43.0