From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.223.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DD7E32571C7 for ; Tue, 23 Sep 2025 07:06:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=195.135.223.131 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758611175; cv=none; b=avxuv39MX+OwB2aVjvuH92QtayynnYAxUDyrnr68/xDpwai6bE9NFy63tvAc0vo4JgK3eUTwwM1ZEQewwNb/00e1QPkEoEwNFt7xyS7MFYof5I0NZUgPJ5lbKPsNevoZ+XTbg6PwsnyGwYm+0Ij4DyMhJBjdqaE4WTUqpKSdvek= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758611175; c=relaxed/simple; bh=PKtJHOhpjzm3pT0yldZezibPr2KlT9zmkoVj0Dqixk4=; h=Message-ID:Date:MIME-Version:Subject:From:To:Cc:References: In-Reply-To:Content-Type; b=ANniuP4CnOsbPMmGKgCqWIHNcE2vfDrpk8e8wVHKphK2T4v8RGnj3YAXGBzj9QGbQYa927R6Oc8tWZ6mXXuShMcqlhNzcahPu1yehBY5LbmHX5LVMjfuIOe1BYrXTWmeXmzkAPpBUpv5qRXAxcP3j+bXsxTYqyDU9ZN3WsrlnLc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=suse.de; spf=pass smtp.mailfrom=suse.de; dkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de header.b=TJEbHV6f; dkim=permerror (0-bit key) header.d=suse.de header.i=@suse.de header.b=LHbk2ecA; dkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de header.b=z9Hzu/RK; dkim=permerror (0-bit key) header.d=suse.de header.i=@suse.de header.b=+lKNdqUp; arc=none smtp.client-ip=195.135.223.131 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=suse.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=suse.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de header.b="TJEbHV6f"; dkim=permerror (0-bit key) header.d=suse.de header.i=@suse.de header.b="LHbk2ecA"; dkim=pass (1024-bit key) header.d=suse.de header.i=@suse.de header.b="z9Hzu/RK"; dkim=permerror (0-bit key) header.d=suse.de header.i=@suse.de header.b="+lKNdqUp" Received: from imap1.dmz-prg2.suse.org (unknown [10.150.64.97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id EE8D61F7A7; Tue, 23 Sep 2025 07:06:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1758611172; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=om3ymGVEgOYZkxH7h2o+iQHAkIkzP/oq9p4NUs/6iTE=; b=TJEbHV6fxtoOTiFsdBBQARzEZmGvOr1pp9sSAo+P/GlU/lOrFwx0VIamB/sO+m+NWc2IK2 6iuNCZUlDjdbtkWa+sfxO7sENZyoJa/a8/Y+cPiqDOauJYi4zvgkJq/unOn3FgHAOZNXlG irPpN6FK24Tdfil6n3xxd/6GU6nL0as= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1758611172; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=om3ymGVEgOYZkxH7h2o+iQHAkIkzP/oq9p4NUs/6iTE=; b=LHbk2ecAokH1cxjeH2efhX4+cfgznd8fR8DJAI57S+2HOcpLVZ6EFoohG2a3iec8TVYLgS 4AnWAzxV/I3F79Cg== Authentication-Results: smtp-out2.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1758611171; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=om3ymGVEgOYZkxH7h2o+iQHAkIkzP/oq9p4NUs/6iTE=; b=z9Hzu/RKZ7C0arizexWPI/PdG8tVYiTYLiPHCe69hoSImNFdZNZdJ+oi9Eh7oQUqHMq8Fm NMUHSrrSn2gs1JxvZ3VbSJV1V8er9OrKf8mTLz0mLNwMESJ5qsRUoTjwkdm53ZyoJXF1PP P28dKDXLmAWYcnWvoGQZ80NGeZBJxic= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1758611171; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=om3ymGVEgOYZkxH7h2o+iQHAkIkzP/oq9p4NUs/6iTE=; b=+lKNdqUpIzurlssiu+HKRw64nbWNwXhC9ZGSeI+AO8QmAhVEpNqinP5yNk0jNXjVWFIESK y2VtOrD48UdMnqCw== Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id 301531388C; Tue, 23 Sep 2025 07:06:08 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id Ykk7O+BG0mhKJgAAD6G6ig (envelope-from ); Tue, 23 Sep 2025 07:06:08 +0000 Message-ID: Date: Tue, 23 Sep 2025 09:06:07 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] drm/gud: Use kmalloc_array() instead of kmalloc() From: Thomas Zimmermann To: Mehdi Ben Hadj Khelifa , maarten.lankhorst@linux.intel.com, mripard@kernel.org, airlied@gmail.com, simona@ffwll.ch, mingo@kernel.org, tglx@linutronix.de, jfalempe@redhat.com, skhan@linuxfoundation.org, david.hunter.linux@gmail.com, Ruben Wauters Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-kernel-mentees@lists.linuxfoundation.org References: <20250922174416.226203-1-mehdi.benhadjkhelifa@gmail.com> <063fbed8-915e-47e5-99fd-ffae22cfb6fa@suse.de> Content-Language: en-US Autocrypt: addr=tzimmermann@suse.de; keydata= xsBNBFs50uABCADEHPidWt974CaxBVbrIBwqcq/WURinJ3+2WlIrKWspiP83vfZKaXhFYsdg XH47fDVbPPj+d6tQrw5lPQCyqjwrCPYnq3WlIBnGPJ4/jreTL6V+qfKRDlGLWFjZcsrPJGE0 BeB5BbqP5erN1qylK9i3gPoQjXGhpBpQYwRrEyQyjuvk+Ev0K1Jc5tVDeJAuau3TGNgah4Yc hdHm3bkPjz9EErV85RwvImQ1dptvx6s7xzwXTgGAsaYZsL8WCwDaTuqFa1d1jjlaxg6+tZsB 9GluwvIhSezPgnEmimZDkGnZRRSFiGP8yjqTjjWuf0bSj5rUnTGiyLyRZRNGcXmu6hjlABEB AAHNJ1Rob21hcyBaaW1tZXJtYW5uIDx0emltbWVybWFubkBzdXNlLmRlPsLAjgQTAQgAOAIb AwULCQgHAgYVCgkICwIEFgIDAQIeAQIXgBYhBHIX+6yM6c9jRKFo5WgNwR1TC3ojBQJftODH AAoJEGgNwR1TC3ojx1wH/0hKGWugiqDgLNXLRD/4TfHBEKmxIrmfu9Z5t7vwUKfwhFL6hqvo lXPJJKQpQ2z8+X2vZm/slsLn7J1yjrOsoJhKABDi+3QWWSGkaGwRJAdPVVyJMfJRNNNIKwVb U6B1BkX2XDKDGffF4TxlOpSQzdtNI/9gleOoUA8+jy8knnDYzjBNOZqLG2FuTdicBXblz0Mf vg41gd9kCwYXDnD91rJU8tzylXv03E75NCaTxTM+FBXPmsAVYQ4GYhhgFt8S2UWMoaaABLDe 7l5FdnLdDEcbmd8uLU2CaG4W2cLrUaI4jz2XbkcPQkqTQ3EB67hYkjiEE6Zy3ggOitiQGcqp j//OwE0EWznS4AEIAMYmP4M/V+T5RY5at/g7rUdNsLhWv1APYrh9RQefODYHrNRHUE9eosYb T6XMryR9hT8XlGOYRwKWwiQBoWSDiTMo/Xi29jUnn4BXfI2px2DTXwc22LKtLAgTRjP+qbU6 3Y0xnQN29UGDbYgyyK51DW3H0If2a3JNsheAAK+Xc9baj0LGIc8T9uiEWHBnCH+RdhgATnWW GKdDegUR5BkDfDg5O/FISymJBHx2Dyoklv5g4BzkgqTqwmaYzsl8UxZKvbaxq0zbehDda8lv hFXodNFMAgTLJlLuDYOGLK2AwbrS3Sp0AEbkpdJBb44qVlGm5bApZouHeJ/+n+7r12+lqdsA EQEAAcLAdgQYAQgAIAIbDBYhBHIX+6yM6c9jRKFo5WgNwR1TC3ojBQJftOH6AAoJEGgNwR1T C3ojVSkIALpAPkIJPQoURPb1VWjh34l0HlglmYHvZszJWTXYwavHR8+k6Baa6H7ufXNQtThR yIxJrQLW6rV5lm7TjhffEhxVCn37+cg0zZ3j7zIsSS0rx/aMwi6VhFJA5hfn3T0TtrijKP4A SAQO9xD1Zk9/61JWk8OysuIh7MXkl0fxbRKWE93XeQBhIJHQfnc+YBLprdnxR446Sh8Wn/2D Ya8cavuWf2zrB6cZurs048xe0UbSW5AOSo4V9M0jzYI4nZqTmPxYyXbm30Kvmz0rYVRaitYJ 4kyYYMhuULvrJDMjZRvaNe52tkKAvMevcGdt38H4KSVXAylqyQOW5zvPc4/sq9c= In-Reply-To: <063fbed8-915e-47e5-99fd-ffae22cfb6fa@suse.de> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[100.00%]; SUSPICIOUS_RECIPS(1.50)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; TAGGED_RCPT(0.00)[]; FUZZY_RATELIMITED(0.00)[rspamd.com]; MIME_TRACE(0.00)[0:+]; RCPT_COUNT_TWELVE(0.00)[14]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; FREEMAIL_TO(0.00)[gmail.com,linux.intel.com,kernel.org,ffwll.ch,linutronix.de,redhat.com,linuxfoundation.org,aol.com]; FREEMAIL_ENVRCPT(0.00)[aol.com,gmail.com]; TO_DN_SOME(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; RCVD_TLS_ALL(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:mid,imap1.dmz-prg2.suse.org:helo] X-Spam-Flag: NO X-Spam-Level: X-Spam-Score: -2.80 Hi Am 23.09.25 um 08:34 schrieb Thomas Zimmermann: > cc Ruben > > Am 22.09.25 um 19:43 schrieb Mehdi Ben Hadj Khelifa: >> Replace kmalloc with kmalloc array in drm/gud/gud_pipe.c since the >> calculation inside kmalloc is dynamic "width * height" and added >> u_char as the size of each element. >> >> Signed-off-by: Mehdi Ben Hadj Khelifa >> --- >>   drivers/gpu/drm/gud/gud_pipe.c | 2 +- >>   1 file changed, 1 insertion(+), 1 deletion(-) >> >> diff --git a/drivers/gpu/drm/gud/gud_pipe.c >> b/drivers/gpu/drm/gud/gud_pipe.c >> index 8d548d08f127..eeea0cb4c7aa 100644 >> --- a/drivers/gpu/drm/gud/gud_pipe.c >> +++ b/drivers/gpu/drm/gud/gud_pipe.c >> @@ -70,7 +70,7 @@ static size_t gud_xrgb8888_to_r124(u8 *dst, const >> struct drm_format_info *format >>       height = drm_rect_height(rect); >>       len = drm_format_info_min_pitch(format, 0, width) * height; >>   -    buf = kmalloc(width * height, GFP_KERNEL); >> +    buf = kmalloc_array(width * height, sizeof(u_char), GFP_KERNEL); u_char is more or less guaranteed to be 8 bit. So what's the point? There's a potential overflow in width * height. If anything, you want to call kmalloc_array(height, width). Best regards Thomas >>       if (!buf) >>           return 0; > -- -- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Frankenstrasse 146, 90461 Nuernberg, Germany GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman HRB 36809 (AG Nuernberg)