linux-kernel - [PATCH] clk: samsung: Fix UBSAN panic in samsung_clk

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Message-ID: <20250212183253.509771-1-willmcvicker@google.com>
Date: Wed, 12 Feb 2025 10:32:52 -0800
From: Will McVicker <willmcvicker@...gle.com>
To: Krzysztof Kozlowski <krzk@...nel.org>, Sylwester Nawrocki <s.nawrocki@...sung.com>, 
	Chanwoo Choi <cw00.choi@...sung.com>, Alim Akhtar <alim.akhtar@...sung.com>, 
	Michael Turquette <mturquette@...libre.com>, Stephen Boyd <sboyd@...nel.org>, Stephen Kitt <steve@....org>, 
	"Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc: Will McVicker <willmcvicker@...gle.com>, kernel-team@...roid.com, 
	linux-samsung-soc@...r.kernel.org, linux-clk@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: [PATCH] clk: samsung: Fix UBSAN panic in samsung_clk_init()

With UBSAN_ARRAY_BOUNDS=y, I'm hitting the below panic due to
dereferencing `ctx->clk_data.hws` before setting
`ctx->clk_data.num = nr_clks`. Move that up to fix the crash.

  UBSAN: array index out of bounds: 00000000f2005512 [#1] PREEMPT SMP
  <snip>
  Call trace:
   samsung_clk_init+0x110/0x124 (P)
   samsung_clk_init+0x48/0x124 (L)
   samsung_cmu_register_one+0x3c/0xa0
   exynos_arm64_register_cmu+0x54/0x64
   __gs101_cmu_top_of_clk_init_declare+0x28/0x60
   ...

Fixes: e620a1e061c4 ("drivers/clk: convert VL struct to struct_size")
Signed-off-by: Will McVicker <willmcvicker@...gle.com>
---
 drivers/clk/samsung/clk.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/samsung/clk.c b/drivers/clk/samsung/clk.c
index 283c523763e6..8d440cf56bd4 100644
--- a/drivers/clk/samsung/clk.c
+++ b/drivers/clk/samsung/clk.c
@@ -74,12 +74,12 @@ struct samsung_clk_provider * __init samsung_clk_init(struct device *dev,
 	if (!ctx)
 		panic("could not allocate clock provider context.\n");
 
+	ctx->clk_data.num = nr_clks;
 	for (i = 0; i < nr_clks; ++i)
 		ctx->clk_data.hws[i] = ERR_PTR(-ENOENT);
 
 	ctx->dev = dev;
 	ctx->reg_base = base;
-	ctx->clk_data.num = nr_clks;
 	spin_lock_init(&ctx->lock);
 
 	return ctx;

base-commit: 2014c95afecee3e76ca4a56956a936e23283f05b
-- 
2.48.1.502.g6dc24dfdaf-goog