[PATCH v7 3/5] misc: fastrpc: Fail Audio PD init when reserved memory is missing

[Jianping Li <jianping.li@oss.qualcomm.com>]

Audio PD static process creation assumes that a reserved-memory
region is defined in DT and exposed via cctx->remote_heap.

If reserved-memory is missing or incomplete, the driver may pass
invalid address/size information to the DSP, leading to undefined
behavior or crashes.

Add explicit validation for remote_heap presence and size before
sending the memory to DSP, and fail early if the configuration is
invalid.

Fixes: 0871561055e66 ("misc: fastrpc: Add support for audiopd")
Cc: stable@kernel.org
Signed-off-by: Jianping Li <jianping.li@oss.qualcomm.com>
---
 drivers/misc/fastrpc.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
index a8a58f889d07..f46a8f53970d 100644
--- a/drivers/misc/fastrpc.c
+++ b/drivers/misc/fastrpc.c
@@ -1354,6 +1354,13 @@ static int fastrpc_init_create_static_process(struct fastrpc_user *fl,
 	} inbuf;
 	u32 sc;
 
+	if (!fl->cctx->remote_heap ||
+	    !fl->cctx->remote_heap->dma_addr ||
+	    !fl->cctx->remote_heap->size) {
+		err = -ENOMEM;
+		dev_dbg(fl->sctx->dev, "remote heap memory region is not added\n");
+		return err;
+	}
 	args = kzalloc_objs(*args, FASTRPC_CREATE_STATIC_PROCESS_NARGS);
 	if (!args)
 		return -ENOMEM;
-- 
2.43.0