From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 C8D0A534456 for ; Tue, 8 Sep 2026 12:23:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788870239; cv=none; b=PiXPcqJ8OdeKaqCaLnOgBfTElYzyAMRNFMXp73YNY9V6b9LXHh1trOj9SldkxNx4mth18kodFH7hIq4Xrom8R+vTipHUMv0xld0d2KtYS6TK46p59/0Kw7OTua7PQJViubKa5xQbZ7spYFtxpMHgUPnYMMTIqCqXXCAacbNI6Oc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788870239; c=relaxed/simple; bh=RCcbifiGKOO1A10PAloKUW6qPLpRa8yIOq3BOVq3cpA=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=I/LiF27UDTQJ3Y4wIxjZ5RxVyTNz+rraAahex3g4w2NqWJvE/ErLTL7OA/zhtYy/POMPvXcJZRf4dJTdUhaRGDRM4El8YVQaYTtNX8tJsWz8d2K0u9/VU1T2IpiWg979l9lmDcNwht59M8CIAmBVT2dzyDHhJHhj3wrG8WHot1Y= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=QCMeyWf8; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="QCMeyWf8" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 050231F00A3A; Tue, 8 Sep 2026 12:23:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1788870237; bh=LMQRmX11SuMEGQr+nEtz0jrrBIH6btYvRni6m/UdLR4=; h=Subject:To:Cc:From:Date; b=QCMeyWf8J0IZXl5HSRUG1UepxL5OJSSlR5jJh781qqQr3WY7GabhlkW6ezDMLG/OS lOpfwpJRttf9zBk3lbOmcJy0vBtofcNn+Jq/hbRQCZNUcVEsDLknkMopyETuVWSa1T 1Ndu6ypixP/GUwLNkuUxn8vxke2Y+tCZC3ySkZ5A= Subject: FAILED: patch "[PATCH] usb: gadget: f_mass_storage: fix null pointer dereference in" failed to apply to 6.18-stable tree To: jeffinphilip14@gmail.com,gregkh@linuxfoundation.org,stable@kernel.org,stern@rowland.harvard.edu Cc: From: Date: Tue, 08 Sep 2026 14:23:50 +0200 Message-ID: <2026090850-ethics-surfer-b50f@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit The patch below does not apply to the 6.18-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.18.y git checkout FETCH_HEAD git cherry-pick -x 2c0f5ca48674a5b5f9fa4a9c3325aa48053af0bc # git commit -s git send-email --to '' --in-reply-to '2026090850-ethics-surfer-b50f@gregkh' --subject-prefix 'PATCH 6.18.y' 'HEAD^..' Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 2c0f5ca48674a5b5f9fa4a9c3325aa48053af0bc Mon Sep 17 00:00:00 2001 From: Jeffin Philip Date: Tue, 18 Aug 2026 09:29:04 +0530 Subject: [PATCH] usb: gadget: f_mass_storage: fix null pointer dereference in fsg_common_set_num_buffers() Previously fsg_num_buffers_validate() was removed as it was not necessary due to Kconfig setting the limits for n from 2 to 256 with default as 2. However, setting the page content in such a way that kstrtou8() reflects n value as either 0 or 1 bypasses these restrictions leading to a null pointer dereference if n is 0. Fix this by adding a check for n < 2 and returning -EINVAL if n is either 0 or 1 consistent with Kconfig logic. Reported-by: syzbot+791be35f1fbcc85d06d7@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=791be35f1fbcc85d06d7 Fixes: fe5a6c48fd95 ("usb: gadget: storage: get rid of fsg_num_buffers_validate()") Cc: stable Signed-off-by: Jeffin Philip Acked-by: Alan Stern Link: https://patch.msgid.link/20260818035904.10324-1-jeffinphilip14@gmail.com Signed-off-by: Greg Kroah-Hartman diff --git a/drivers/usb/gadget/function/f_mass_storage.c b/drivers/usb/gadget/function/f_mass_storage.c index 1a0fbc808ee2..fc4818fb2a8b 100644 --- a/drivers/usb/gadget/function/f_mass_storage.c +++ b/drivers/usb/gadget/function/f_mass_storage.c @@ -2747,6 +2747,9 @@ int fsg_common_set_num_buffers(struct fsg_common *common, unsigned int n) struct fsg_buffhd *bh, *buffhds; int i; + if (n < 2) + return -EINVAL; + buffhds = kzalloc_objs(*buffhds, n); if (!buffhds) return -ENOMEM;