linux-kernel - [PATCH v3 3/9] misc: fastrpc: Fix memory corruption in DSP capabilities

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Date: Thu, 30 May 2024 15:50:21 +0530
From: Ekansh Gupta <quic_ekangupt@...cinc.com>
To: <srinivas.kandagatla@...aro.org>, <linux-arm-msm@...r.kernel.org>
CC: <gregkh@...uxfoundation.org>, <quic_bkumar@...cinc.com>,
        <linux-kernel@...r.kernel.org>, <quic_chennak@...cinc.com>,
        stable
	<stable@...nel.org>
Subject: [PATCH v3 3/9] misc: fastrpc: Fix memory corruption in DSP capabilities

DSP capabilities request is sending bad size to utilities skel
call which is resulting in memory corruption. Pass proper size
to avoid the corruption.

Fixes: 6c16fd8bdd40 ("misc: fastrpc: Add support to get DSP capabilities")
Cc: stable <stable@...nel.org>
Signed-off-by: Ekansh Gupta <quic_ekangupt@...cinc.com>
---
 drivers/misc/fastrpc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
index 61389795f498..3e1ab58038ed 100644
--- a/drivers/misc/fastrpc.c
+++ b/drivers/misc/fastrpc.c
@@ -1695,6 +1695,7 @@ static int fastrpc_get_info_from_dsp(struct fastrpc_user *fl, uint32_t *dsp_attr
 
 	/* Capability filled in userspace */
 	dsp_attr_buf[0] = 0;
+	dsp_attr_buf_len -= 1;
 
 	args[0].ptr = (u64)(uintptr_t)&dsp_attr_buf_len;
 	args[0].length = sizeof(dsp_attr_buf_len);
-- 
2.43.0