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bus: sunxi-rsb: Always check register address validity

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The register address was already validated for read operations in
regmap_sunxi_rsb_reg_read before being truncated to a u8. Write operations
have the same set of possible addresses, and the address is being truncated
from u32 to u8 here as well, so the same check is needed.

Signed-off-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Andrey Skvortsov <andrej.skvortzov@gmail.com>
Fixes: d787dcdb9c ("bus: sunxi-rsb: Add driver for Allwinner Reduced Serial Bus")
Reviewed-by: Chen-Yu Tsai <wens@kernel.org>
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://patch.msgid.link/20260301144939.1832806-1-andrej.skvortzov@gmail.com
Signed-off-by: Chen-Yu Tsai <wens@kernel.org>
This commit is contained in:
Samuel Holland 2026-03-01 17:49:39 +03:00 committed by Chen-Yu Tsai
parent b708294322
commit 61192938a5
1 changed files with 3 additions and 0 deletions
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3
drivers/bus/sunxi-rsb.c
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@ -445,6 +445,9 @@ static int regmap_sunxi_rsb_reg_write(void *context, unsigned int reg,
struct sunxi_rsb_ctx *ctx = context;
struct sunxi_rsb_device *rdev = ctx->rdev;
if (reg > 0xff)
return -EINVAL;
return sunxi_rsb_write(rdev->rsb, rdev->rtaddr, reg, &val, ctx->size);
}