This is a note to let you know that I've just added the patch titled
intel_th: msu-sink: Potential dereference of null pointer
to the 5.4-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:
intel_th-msu-sink-potential-dereference-of-null-poin.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 5eecec68ca1232fca2e5896f412aebad12911b67
Author: Jiasheng Jiang <jiasheng@xxxxxxxxxxx>
Date: Tue Jul 5 11:26:33 2022 +0300
intel_th: msu-sink: Potential dereference of null pointer
[ Upstream commit 82f76a4a720791d889de775b5f7541d601efc8bd ]
The return value of dma_alloc_coherent() needs to be checked.
To avoid use of null pointer in sg_set_buf() in case of the failure of
alloc.
Fixes: f220df66f676 ("intel_th: msu-sink: An example msu buffer "sink"")
Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Signed-off-by: Jiasheng Jiang <jiasheng@xxxxxxxxxxx>
Signed-off-by: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20220705082637.59979-3-alexander.shishkin@xxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/hwtracing/intel_th/msu-sink.c b/drivers/hwtracing/intel_th/msu-sink.c
index 2c7f5116be12..891b28ea25fe 100644
--- a/drivers/hwtracing/intel_th/msu-sink.c
+++ b/drivers/hwtracing/intel_th/msu-sink.c
@@ -71,6 +71,9 @@ static int msu_sink_alloc_window(void *data, struct sg_table **sgt, size_t size)
block = dma_alloc_coherent(priv->dev->parent->parent,
PAGE_SIZE, &sg_dma_address(sg_ptr),
GFP_KERNEL);
+ if (!block)
+ return -ENOMEM;
+
sg_set_buf(sg_ptr, block, PAGE_SIZE);
}
