linux-kernel - [PATCH AUTOSEL 5.8 04/29] habanalabs: prevent user buff overflow

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Date:   Mon, 14 Sep 2020 09:03:33 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Moti Haimovski <mhaimovski@...ana.ai>,
        Oded Gabbay <oded.gabbay@...il.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 5.8 04/29] habanalabs: prevent user buff overflow

From: Moti Haimovski <mhaimovski@...ana.ai>

[ Upstream commit 6396feabf7a4104a4ddfecc00b8aac535c631a66 ]

This commit fixes a potential debugfs issue that may occur when
reading the clock gating mask into the user buffer since the
user buffer size was not taken into consideration.

Signed-off-by: Moti Haimovski <mhaimovski@...ana.ai>
Reviewed-by: Oded Gabbay <oded.gabbay@...il.com>
Signed-off-by: Oded Gabbay <oded.gabbay@...il.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/misc/habanalabs/debugfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/misc/habanalabs/debugfs.c b/drivers/misc/habanalabs/debugfs.c
index 6c2b9cf45e831..650922061bdc7 100644
--- a/drivers/misc/habanalabs/debugfs.c
+++ b/drivers/misc/habanalabs/debugfs.c
@@ -982,7 +982,7 @@ static ssize_t hl_clk_gate_read(struct file *f, char __user *buf,
 		return 0;
 
 	sprintf(tmp_buf, "0x%llx\n", hdev->clock_gating_mask);
-	rc = simple_read_from_buffer(buf, strlen(tmp_buf) + 1, ppos, tmp_buf,
+	rc = simple_read_from_buffer(buf, count, ppos, tmp_buf,
 			strlen(tmp_buf) + 1);
 
 	return rc;
-- 
2.25.1