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HID: Intel-thc-hid: Intel-thc: Add safety check for reading DMA buffer

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Add DMA buffer readiness check before reading DMA buffer to avoid
unexpected NULL pointer accessing.

Signed-off-by: Even Xu <even.xu@intel.com>
Tested-by: Rui Zhang <rui1.zhang@intel.com>
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
This commit is contained in:
Even Xu
2025-12-26 11:39:53 +08:00
committed by Benjamin Tissoires
parent dd76788f9e
commit a9a917998d
1 changed files with 5 additions and 0 deletions
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5
drivers/hid/intel-thc-hid/intel-thc/intel-thc-dma.c
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@@ -575,6 +575,11 @@ static int read_dma_buffer(struct thc_device *dev,
return -EINVAL;
}
if (!read_config->prd_tbls || !read_config->sgls[prd_table_index]) {
dev_err_once(dev->dev, "PRD tables are not ready yet\n");
return -EINVAL;
}
prd_tbl = &read_config->prd_tbls[prd_table_index];
mes_len = calc_message_len(prd_tbl, &nent);
if (mes_len > read_config->max_packet_size) {