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Tue, 14 Jul 2026 07:17:51 -0700 (PDT) Date: Tue, 14 Jul 2026 10:17:49 -0400 From: Brian Masney To: kdamaski Cc: Yifeng Huang , Xuyang Dong , Michael Turquette , Stephen Boyd , linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] clk: eswin: Zero-initialize stack-allocated clk_init_data Message-ID: References: <20260710141520.285132-1-kostas.damaskinakis@gmail.com> Precedence: bulk X-Mailing-List: linux-clk@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260710141520.285132-1-kostas.damaskinakis@gmail.com> User-Agent: Mutt/2.4.0 (2026-06-19) On Fri, Jul 10, 2026 at 05:15:20PM +0300, kdamaski wrote: > From: Kostas Damaskinakis > > eswin_clk_register_pll() and eswin_register_clkdiv() declare a struct > clk_init_data on the stack and only initialize some of its fields > (parent_data respectively parent_hws). clk_core_populate_parent_map() > checks parent_names first and parent_data second before falling back > to parent_hws, so leftover stack garbage in the uninitialized fields > hijacks parent resolution and the clk core dereferences a bogus > pointer: > > Unable to handle kernel NULL pointer dereference at virtual address 000000000000000c > Oops [#1] > epc : __clk_register+0x31a/0x7f0 > [] __clk_register+0x31a/0x7f0 > [] devm_clk_hw_register+0x2a/0x94 > [] eswin_register_clkdiv+0x80/0xd0 > [] eswin_clk_register_clks+0x162/0x1a0 > [] eic7700_clk_probe+0x146/0x180 > [] platform_probe+0x3c/0x7a > > Observed on EIC7700 hardware (with the driver backported to a 6.17 > tree); whether the bug triggers depends entirely on what the stack > happens to contain when the registration helpers run. > > Zero-initialize both structures. > > Fixes: cd44f127c1d4 ("clk: eswin: Add eic7700 clock driver") > Signed-off-by: Kostas Damaskinakis Reviewed-by: Brian Masney