From: Nathan Chancellor nathan@kernel.org
stable inclusion from stable-v6.6.34 commit 0dc913217fb79096597005bba9ba738e2db5cd02 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IA8AEG CVE: CVE-2024-39462
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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commit 9368cdf90f52a68120d039887ccff74ff33b4444 upstream.
Commit f316cdff8d67 ("clk: Annotate struct clk_hw_onecell_data with __counted_by") annotated the hws member of 'struct clk_hw_onecell_data' with __counted_by, which informs the bounds sanitizer about the number of elements in hws, so that it can warn when hws is accessed out of bounds. As noted in that change, the __counted_by member must be initialized with the number of elements before the first array access happens, otherwise there will be a warning from each access prior to the initialization because the number of elements is zero. This occurs in clk_dvp_probe() due to ->num being assigned after ->hws has been accessed:
UBSAN: array-index-out-of-bounds in drivers/clk/bcm/clk-bcm2711-dvp.c:59:2 index 0 is out of range for type 'struct clk_hw *[] __counted_by(num)' (aka 'struct clk_hw *[]')
Move the ->num initialization to before the first access of ->hws, which clears up the warning.
Cc: stable@vger.kernel.org Fixes: f316cdff8d67 ("clk: Annotate struct clk_hw_onecell_data with __counted_by") Signed-off-by: Nathan Chancellor nathan@kernel.org Link: https://lore.kernel.org/r/20240425-cbl-bcm-assign-counted-by-val-before-acce... Reviewed-by: Kees Cook keescook@chromium.org Reviewed-by: Florian Fainelli florian.fainelli@broadcom.com Signed-off-by: Stephen Boyd sboyd@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Huang Xiaojia huangxiaojia2@huawei.com --- drivers/clk/bcm/clk-bcm2711-dvp.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/clk/bcm/clk-bcm2711-dvp.c b/drivers/clk/bcm/clk-bcm2711-dvp.c index e4fbbf3c40fe..3cb235df9d37 100644 --- a/drivers/clk/bcm/clk-bcm2711-dvp.c +++ b/drivers/clk/bcm/clk-bcm2711-dvp.c @@ -56,6 +56,8 @@ static int clk_dvp_probe(struct platform_device *pdev) if (ret) return ret;
+ data->num = NR_CLOCKS; + data->hws[0] = clk_hw_register_gate_parent_data(&pdev->dev, "hdmi0-108MHz", &clk_dvp_parent, 0, @@ -76,7 +78,6 @@ static int clk_dvp_probe(struct platform_device *pdev) goto unregister_clk0; }
- data->num = NR_CLOCKS; ret = of_clk_add_hw_provider(pdev->dev.of_node, of_clk_hw_onecell_get, data); if (ret)