Patch "coresight: Fix signedness bug in tmc_etr_buf_insert_barrier_packet()" has been added to the 5.10-stable tree

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This is a note to let you know that I've just added the patch titled

    coresight: Fix signedness bug in tmc_etr_buf_insert_barrier_packet()

to the 5.10-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:
     coresight-fix-signedness-bug-in-tmc_etr_buf_insert_barrier_packet.patch
and it can be found in the queue-5.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From f67bc15e526bb9920683ad6c1891ff9e08981335 Mon Sep 17 00:00:00 2001
From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Date: Fri, 21 Apr 2023 13:42:41 +0300
Subject: coresight: Fix signedness bug in tmc_etr_buf_insert_barrier_packet()

From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

commit f67bc15e526bb9920683ad6c1891ff9e08981335 upstream.

This code generates a Smatch warning:

    drivers/hwtracing/coresight/coresight-tmc-etr.c:947 tmc_etr_buf_insert_barrier_packet()
    error: uninitialized symbol 'bufp'.

The problem is that if tmc_sg_table_get_data() returns -EINVAL, then
when we test if "len < CORESIGHT_BARRIER_PKT_SIZE", the negative "len"
value is type promoted to a high unsigned long value which is greater
than CORESIGHT_BARRIER_PKT_SIZE.  Fix this bug by adding an explicit
check for error codes.

Fixes: 75f4e3619fe2 ("coresight: tmc-etr: Add transparent buffer management")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
Link: https://lore.kernel.org/r/7d33e244-d8b9-4c27-9653-883a13534b01@kili.mountain
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/hwtracing/coresight/coresight-tmc-etr.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c
@@ -926,7 +926,7 @@ tmc_etr_buf_insert_barrier_packet(struct
 
 	len = tmc_etr_buf_get_data(etr_buf, offset,
 				   CORESIGHT_BARRIER_PKT_SIZE, &bufp);
-	if (WARN_ON(len < CORESIGHT_BARRIER_PKT_SIZE))
+	if (WARN_ON(len < 0 || len < CORESIGHT_BARRIER_PKT_SIZE))
 		return -EINVAL;
 	coresight_insert_barrier_packet(bufp);
 	return offset + CORESIGHT_BARRIER_PKT_SIZE;


Patches currently in stable-queue which might be from dan.carpenter@xxxxxxxxxx are

queue-5.10/coresight-fix-signedness-bug-in-tmc_etr_buf_insert_barrier_packet.patch
queue-5.10/alsa-firewire-digi00x-prevent-potential-use-after-fr.patch
queue-5.10/xen-pvcalls-back-fix-double-frees-with-pvcalls_new_active_socket.patch



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