From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A24C27E for ; Mon, 25 Jul 2022 23:37:44 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C32BBC341C6; Mon, 25 Jul 2022 23:37:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1658792264; bh=+T4z1E56ig294fgsdgVrPcM/eeCX5DkWMlE7eJwNtKk=; h=From:To:Cc:Subject:Date:From; b=AhahugvCsBz3fF3YLZE79oj2+uJabN3WHicYdsOOBSlv2zTtwbdNfZomepBfH7lM0 fTlx4UA7fylq4fh4wDt3Hu0pIY7YJ2Zy4AlGYpB0CQweSNUbERbuepTBagiFSMLc7R TopTgnt57STx9vSPlwXcx50pIzWv5cEKG6n9Tc3jk1gI5LPJuGsZ7YKblw1NIdR/zb RAyGEJ4mcVXLUX28FyvYsV+eWX/gby1kZvzSIHtBktMww4wchqwVZyYWqrTlpGbKAM k1acG0nQlL46SBNJljCUk2M+pGn5FS98XiTeciTLwg+sjqvLWlfRgAsXcDD3LDi4Ha xRMXAWuSqfSdA== From: Nathan Chancellor To: Thomas Zimmermann , Javier Martinez Canillas Cc: Sami Tolvanen , Kees Cook , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, llvm@lists.linux.dev, Nathan Chancellor , stable@vger.kernel.org, =?UTF-8?q?Tomasz=20Pawe=C5=82=20Gajc?= Subject: [PATCH] drm/simpledrm: Fix return type of simpledrm_simple_display_pipe_mode_valid() Date: Mon, 25 Jul 2022 16:36:29 -0700 Message-Id: <20220725233629.223223-1-nathan@kernel.org> X-Mailer: git-send-email 2.37.1 Precedence: bulk X-Mailing-List: llvm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit When booting a kernel compiled with clang's CFI protection (CONFIG_CFI_CLANG), there is a CFI failure in drm_simple_kms_crtc_mode_valid() when trying to call simpledrm_simple_display_pipe_mode_valid() through ->mode_valid(): [ 0.322802] CFI failure (target: simpledrm_simple_display_pipe_mode_valid+0x0/0x8): ... [ 0.324928] Call trace: [ 0.324969] __ubsan_handle_cfi_check_fail+0x58/0x60 [ 0.325053] __cfi_check_fail+0x3c/0x44 [ 0.325120] __cfi_slowpath_diag+0x178/0x200 [ 0.325192] drm_simple_kms_crtc_mode_valid+0x58/0x80 [ 0.325279] __drm_helper_update_and_validate+0x31c/0x464 ... The ->mode_valid() member in 'struct drm_simple_display_pipe_funcs' expects a return type of 'enum drm_mode_status', not 'int'. Correct it to fix the CFI failure. Cc: stable@vger.kernel.org Fixes: 11e8f5fd223b ("drm: Add simpledrm driver") Link: https://github.com/ClangBuiltLinux/linux/issues/1647 Reported-by: Tomasz Paweł Gajc Signed-off-by: Nathan Chancellor --- drivers/gpu/drm/tiny/simpledrm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/tiny/simpledrm.c b/drivers/gpu/drm/tiny/simpledrm.c index 768242a78e2b..5422363690e7 100644 --- a/drivers/gpu/drm/tiny/simpledrm.c +++ b/drivers/gpu/drm/tiny/simpledrm.c @@ -627,7 +627,7 @@ static const struct drm_connector_funcs simpledrm_connector_funcs = { .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, }; -static int +static enum drm_mode_status simpledrm_simple_display_pipe_mode_valid(struct drm_simple_display_pipe *pipe, const struct drm_display_mode *mode) { base-commit: e0dccc3b76fb35bb257b4118367a883073d7390e -- 2.37.1