change system file

hc

2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771

 kernel/drivers/firmware/arm_scmi/shmem.c
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@@ -58,10 +58,11 @@
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 void shmem_fetch_response(struct scmi_shared_mem __iomem *shmem,
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 			  struct scmi_xfer *xfer)
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 {
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+	size_t len = ioread32(&shmem->length);
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+
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 	xfer->hdr.status = ioread32(shmem->msg_payload);
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 	/* Skip the length of header and status in shmem area i.e 8 bytes */
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-	xfer->rx.len = min_t(size_t, xfer->rx.len,
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-			     ioread32(&shmem->length) - 8);
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+	xfer->rx.len = min_t(size_t, xfer->rx.len, len > 8 ? len - 8 : 0);
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 	/* Take a copy to the rx buffer.. */
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 	memcpy_fromio(xfer->rx.buf, shmem->msg_payload + 4, xfer->rx.len);
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@@ -70,8 +71,10 @@
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 void shmem_fetch_notification(struct scmi_shared_mem __iomem *shmem,
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 			      size_t max_len, struct scmi_xfer *xfer)
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 {
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+	size_t len = ioread32(&shmem->length);
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+
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 	/* Skip only the length of header in shmem area i.e 4 bytes */
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-	xfer->rx.len = min_t(size_t, max_len, ioread32(&shmem->length) - 4);
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+	xfer->rx.len = min_t(size_t, max_len, len > 4 ? len - 4 : 0);
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 	/* Take a copy to the rx buffer.. */
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 	memcpy_fromio(xfer->rx.buf, shmem->msg_payload, xfer->rx.len);