[PATCH] firmware: arm_ffa: fix memory corruption in ffa_msg_send2()

[PATCH] firmware: arm_ffa: fix memory corruption in ffa_msg_send2()

[Dan Carpenter]

The "msg" pointer is a struct and msg->offset is the sizeof(*msg).  The
pointer here math means the memcpy() will write outside the bounds.
Cast "msg" to a u8 pointer to fix this.

Fixes: 02c19d84c7c5 ("firmware: arm_ffa: Add support for FFA_MSG_SEND2")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
---
 drivers/firmware/arm_ffa/driver.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c
index 9f89ee0aaa6b..363e86936461 100644
--- a/drivers/firmware/arm_ffa/driver.c
+++ b/drivers/firmware/arm_ffa/driver.c
@@ -363,7 +363,7 @@ static int ffa_msg_send2(u16 src_id, u16 dst_id, void *buf, size_t sz)
 	msg->offset = sizeof(*msg);
 	msg->send_recv_id = src_dst_ids;
 	msg->size = sz;
-	memcpy(msg + msg->offset, buf, sz);
+	memcpy((u8 *)msg + msg->offset, buf, sz);
 
 	/* flags = 0, sender VMID = 0 works for both physical/virtual NS */
 	invoke_ffa_fn((ffa_value_t){
-- 
2.43.0


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Re: [PATCH] firmware: arm_ffa: fix memory corruption in ffa_msg_send2()

[Sudeep Holla]

On Wed, 24 Apr 2024 14:40:43 +0300, Dan Carpenter wrote:
> The "msg" pointer is a struct and msg->offset is the sizeof(*msg).  The
> pointer here math means the memcpy() will write outside the bounds.
> Cast "msg" to a u8 pointer to fix this.
>
Applied to sudeep.holla/linux (for-next/ffa/updates), thanks!

[1/1] firmware: arm_ffa: fix memory corruption in ffa_msg_send2()
      https://git.kernel.org/sudeep.holla/c/ddfade88f49d
--
Regards,
Sudeep


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