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 5.15-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-5.15 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-5.15/coresight-fix-signedness-bug-in-tmc_etr_buf_insert_barrier_packet.patch
queue-5.15/xen-pvcalls-back-fix-double-frees-with-pvcalls_new_active_socket.patch
