On Mon, Nov 24, 2025 at 12:11:06PM -0700, Nathan Chancellor wrote:
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 (UBSAN_BOUNDS) 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 exynos_clkout_probe() due to .num being assigned after .hws[] has been accessed:
UBSAN: array-index-out-of-bounds in drivers/clk/samsung/clk-exynos-clkout.c:178:18 index 0 is out of range for type 'clk_hw *[*]'
Move the .num initialization to before the first access of .hws[], clearing up the warning.
Cc: stable@vger.kernel.org Fixes: f316cdff8d67 ("clk: Annotate struct clk_hw_onecell_data with __counted_by") Reported-by: Jochen Sprickerhof jochen@sprickerhof.de Closes: https://lore.kernel.org/aSIYDN5eyKFKoXKL@eldamar.lan/ Tested-by: Jochen Sprickerhof jochen@sprickerhof.de Signed-off-by: Nathan Chancellor nathan@kernel.org
Reviewed-by: Kees Cook kees@kernel.org