[PATCH 6.18 556/752] mailbox: Prevent out-of-bounds access in fw_mbox_index_xlate()

Sasha Levin
2026-02-28T17:56:07Z

From: Joonwon Kang <joonwonkang@google.com>

[ Upstream commit fcd7f96c783626c07ee3ed75fa3739a8a2052310 ]

Although it is guided that `#mbox-cells` must be at least 1, there are
many instances of `#mbox-cells = <0>;` in the device tree. If that is
the case and the corresponding mailbox controller does not provide
`fw_xlate` and of_xlate` function pointers, `fw_mbox_index_xlate()` will
be used by default and out-of-bounds accesses could occur due to lack of
bounds check in that function.

Cc: stable@vger.kernel.org
Signed-off-by: Joonwon Kang <joonwonkang@google.com>
Signed-off-by: Jassi Brar <jassisinghbrar@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/mailbox/mailbox.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/mailbox/mailbox.c b/drivers/mailbox/mailbox.c
index 2acc6ec229a45..617ba505691d3 100644
--- a/drivers/mailbox/mailbox.c
+++ b/drivers/mailbox/mailbox.c
@@ -489,12 +489,10 @@ EXPORT_SYMBOL_GPL(mbox_free_channel);
static struct mbox_chan *fw_mbox_index_xlate(struct mbox_controller *mbox,
const struct fwnode_reference_args *sp)
{
- int ind = sp->args[0];
-
- if (ind >= mbox->num_chans)
+ if (sp->nargs < 1 || sp->args[0] >= mbox->num_chans)
return ERR_PTR(-EINVAL);

- return &mbox->chans[ind];
+ return &mbox->chans[sp->args[0]];
}

/**
--
2.51.0