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| author | Leonard Crestez <leonard.crestez@nxp.com> | 2019-09-04 10:54:58 +0300 |
|---|---|---|
| committer | Shawn Guo <shawnguo@kernel.org> | 2019-10-06 08:58:59 +0800 |
| commit | cf0fd404455ce13850cc15423a3c2958933de384 (patch) | |
| tree | a24e4e0c6c02b4568700dc787336f8c890a37caa /drivers/firmware | |
| parent | 54ecb8f7028c5eb3d740bb82b0f1d90f2df63c5c (diff) | |
| download | linux-cf0fd404455ce13850cc15423a3c2958933de384.tar.gz linux-cf0fd404455ce13850cc15423a3c2958933de384.tar.bz2 linux-cf0fd404455ce13850cc15423a3c2958933de384.zip | |
firmware: imx: warn on unexpected RX
The imx_scu_call_rpc function returns the result inside the
same "msg" struct containing the transmitted message. This is
implemented by holding a pointer to msg (which is usually on the stack)
in sc_imx_rpc and writing to it from imx_scu_rx_callback.
This means that if the have_resp parameter is incorrect or SCU sends an
unexpected response for any reason the most likely result is kernel stack
corruption.
Fix this by only setting sc_imx_rpc.msg for the duration of the
imx_scu_call_rpc call and warning in imx_scu_rx_callback if unset.
Print the unexpected response data to help debugging.
Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
Acked-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Diffstat (limited to 'drivers/firmware')
| -rw-r--r-- | drivers/firmware/imx/imx-scu.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/firmware/imx/imx-scu.c b/drivers/firmware/imx/imx-scu.c index 04a24a863d6e..869be7a5172c 100644 --- a/drivers/firmware/imx/imx-scu.c +++ b/drivers/firmware/imx/imx-scu.c @@ -107,6 +107,12 @@ static void imx_scu_rx_callback(struct mbox_client *c, void *msg) struct imx_sc_rpc_msg *hdr; u32 *data = msg; + if (!sc_ipc->msg) { + dev_warn(sc_ipc->dev, "unexpected rx idx %d 0x%08x, ignore!\n", + sc_chan->idx, *data); + return; + } + if (sc_chan->idx == 0) { hdr = msg; sc_ipc->rx_size = hdr->size; @@ -165,7 +171,8 @@ int imx_scu_call_rpc(struct imx_sc_ipc *sc_ipc, void *msg, bool have_resp) mutex_lock(&sc_ipc->lock); reinit_completion(&sc_ipc->done); - sc_ipc->msg = msg; + if (have_resp) + sc_ipc->msg = msg; sc_ipc->count = 0; ret = imx_scu_ipc_write(sc_ipc, msg); if (ret < 0) { @@ -187,6 +194,7 @@ int imx_scu_call_rpc(struct imx_sc_ipc *sc_ipc, void *msg, bool have_resp) } out: + sc_ipc->msg = NULL; mutex_unlock(&sc_ipc->lock); dev_dbg(sc_ipc->dev, "RPC SVC done\n"); |