i3c: mipi-i3c-hci: Fix out of bounds access in hci_dma_irq_handler

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@linux.intel.com>
Link: https://lore.kernel.org/r/20230921055704.1087277-5-jarkko.nikula@linux.intel.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

diff --git a/drivers/i3c/master/mipi-i3c-hci/dma.c b/drivers/i3c/master/mipi-i3c-hci/dma.c
index a1ecdfc35641b8e266358d904862622688e88bb9..9897145895c683dab968870e573821a5f81b5958 100644 (file)
--- 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;