linux-kernel - [PATCH AUTOSEL 6.1 1/6] i3c: mipi-i3c-hci: Fix out of bounds access in hci_dma_irq

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Message-ID: <20231112132408.174499-1-sashal@kernel.org>
Date:   Sun, 12 Nov 2023 08:23:56 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Sasha Levin <sashal@...nel.org>, gustavoars@...nel.org,
        keescook@...omium.org, linux-i3c@...ts.infradead.org
Subject: [PATCH AUTOSEL 6.1 1/6] i3c: mipi-i3c-hci: Fix out of bounds access in hci_dma_irq_handler

From: Jarkko Nikula <jarkko.nikula@...ux.intel.com>

[ Upstream commit 45a832f989e520095429589d5b01b0c65da9b574 ]

Do not loop over ring headers in hci_dma_irq_handler() that are not
allocated and enabled in hci_dma_init(). Otherwise out of bounds access
will occur from rings->headers[i] access when i >= number of allocated
ring headers.

Signed-off-by: Jarkko Nikula <jarkko.nikula@...ux.intel.com>
Link: https://lore.kernel.org/r/20230921055704.1087277-5-jarkko.nikula@linux.intel.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/i3c/master/mipi-i3c-hci/dma.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/i3c/master/mipi-i3c-hci/dma.c b/drivers/i3c/master/mipi-i3c-hci/dma.c
index 2990ac9eaade7..71b5dbe45c45c 100644
--- a/drivers/i3c/master/mipi-i3c-hci/dma.c
+++ b/drivers/i3c/master/mipi-i3c-hci/dma.c
@@ -734,7 +734,7 @@ static bool hci_dma_irq_handler(struct i3c_hci *hci, unsigned int mask)
 	unsigned int i;
 	bool handled = false;
 
-	for (i = 0; mask && i < 8; i++) {
+	for (i = 0; mask && i < rings->total; i++) {
 		struct hci_rh_data *rh;
 		u32 status;
 
-- 
2.42.0