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 3210B52FE51 for ; Tue, 8 Sep 2026 12:24:12 +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=1788870253; cv=none; b=cv2EatkkDyXASB7nxph2Oa1vGywqCg7tELzTIIg+LnJBMZ4zgPdPOt31Gf33/9bRgm/Gl5v4YFwjq0n2xfK3GSSimwQ11PQJECGoPZd0w4IL/iZLCXF+3Bhhc8U/fjR0NGl5bG25ADu5hSXhhSeZ8I0mxvUfPOPp8tnONkVNcq0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788870253; c=relaxed/simple; bh=ciueCP4j6MZ1wf/nW6rssYxSh9ADyVe9OL40/U/Y/Ks=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=r6ch0OOdkUWaYkrxftky+6UI691qTcryufyYQhWUQpZy3ZYcg0EQoLsmsrbMJU/C3DgMZpgsDtQnpnrN0rtB0lFHZuVlsBnJ1pyJZDa7/6fmv+qcNJqf73MS1cpD+Pw1zS7WTPhPLDlxtlosY499qm3IKL+8O8oIc1fYndBwpEE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=ltnItXBI; 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="ltnItXBI" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7B45C1F00A3A; Tue, 8 Sep 2026 12:24:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1788870252; bh=SiryYW6+qDgD2au5me8EpK3vMoOU6Ykgejjr/BslWG8=; h=Subject:To:Cc:From:Date; b=ltnItXBIHM/NvRJkEorb7KVXuzqW/XgcR2nUQh9rEXnbK2aHOHkHa2gQsGYi/1ocr /gHuQJpOkLpIx4JRxmfmTCRnZGWyGfqVOnDerx6D5GLf4zFanzIHHygK7h9aAN5Ymf 997pkJLfyi5+mfa+6h5A+IUaV52i1br2M2Ucjc6M= Subject: FAILED: patch "[PATCH] usb: gadget: f_mass_storage: fix null pointer dereference in" failed to apply to 6.6-stable tree To: jeffinphilip14@gmail.com,gregkh@linuxfoundation.org,stable@kernel.org,stern@rowland.harvard.edu Cc: From: Date: Tue, 08 Sep 2026 14:23:51 +0200 Message-ID: <2026090851-diameter-thermal-3fb2@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 6.6-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-6.6.y git checkout FETCH_HEAD git cherry-pick -x 2c0f5ca48674a5b5f9fa4a9c3325aa48053af0bc # git commit -s git send-email --to '' --in-reply-to '2026090851-diameter-thermal-3fb2@gregkh' --subject-prefix 'PATCH 6.6.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;