From nobody Fri Nov 29 19:52:08 2024 Received: from mail-pj1-f54.google.com (mail-pj1-f54.google.com [209.85.216.54]) (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 A614623A9; Mon, 16 Sep 2024 05:21:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.54 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726464093; cv=none; b=uFKZvjIE6ce1allmuQSdo8fmRxrO2ViVgbEFeUiOWykLPijnHE2dfEmIr9NKwHkYtp1sBbwYdKhSh8WSbe/DBNsh3lVEQLalhkfXGTq9pXWN3XOPDxn+E0Q7WKk1Hm6m15K/RJQU7YGyGcVEFoOBly00P03DLCooK67v4vk0a9Q= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726464093; c=relaxed/simple; bh=6BSWlbShZI6FKCL+zCzIx1gPc3gWvUY+0MVQjYwSloQ=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=UK2uB2S0fuOTBwvsHMTGdajmlJe0yI7OHmoRMIvNMS0pmJxY39/6LqkppTuR0O4veSLA0iPC0SraqUH3ajUN4CRRj77U1X51CBlqIsqJmHDASoE8dXLQ13Gt8YWGjyFnv/xXrfU+mVKRTegP9564VNkMfScMj7wsQG+jaKKo4Og= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=Lsq2KmeB; arc=none smtp.client-ip=209.85.216.54 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Lsq2KmeB" Received: by mail-pj1-f54.google.com with SMTP id 98e67ed59e1d1-2d889ba25f7so1932258a91.0; Sun, 15 Sep 2024 22:21:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1726464091; x=1727068891; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=MZPn/+H1ASm7qkxU/tBBk3TPehptgKtNICy+pHBy4t4=; b=Lsq2KmeB/YRjptOC8fivjzPCk1WKoLGy1QVxVK4x5LyPQeD8/LnO6E29pvEVzsma9v 2heihrKj2UKBVZOKONmqqUXIySBq6zVRuAn9P6hIWK69QB1BvnrcOxUe9euyQ9OiXf0k TdcWWKqCQtXRaTZhT+I+qciYy4gyatqK8lAzgKABKFb6dO4yquTNjUh/MOI+hu3F0Phg Z5lhFzIzDoI1f9MG/sHCqpEEUr4J3wiWiKrAYNGDLdTDew760MAjrOe2J8LtFD5KxA0V Nk+Feni7ZfeqJ+JbRytPoRxi26fHy4lvqjp0pquXh1G7b73YNksuCrhK+eHSqDhvlGaX OjsA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1726464091; x=1727068891; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=MZPn/+H1ASm7qkxU/tBBk3TPehptgKtNICy+pHBy4t4=; b=IgoAAEGH5dQSlYvonbodco2r1BT82UV4F0vNu0NoCmhb9InNiHYCwufqurShqKCqfJ dTwjZKGM4N1oXBAMNwCDinXnx5g0g9wFjNPaN/jCZEvb1VnG4zZQTA/seJi3gMZ1LLhQ 4c7ffhMHnTIA87czkrAd2zKbpMBrER3UpHOIPU3lZ3V1tulOxAjdbMhSiswRpnwxjTVB KkcL+I5RIjzpVNslMhfzgWyTnVfhiSjn3+WKli+GdrClHVSgkQUmVqgg5is1r0qBybX+ vmyfA0CnfJoJ6YnnWRzG87/pL0mMANfmEV6TwDrARvBtiI1OqILEth1LaguyVZEQ/8kd bm+A== X-Forwarded-Encrypted: i=1; AJvYcCVeuN++nqDHe2jb8otsZfhJxXMqe1P22cHRHagNztyBTAw0Gkx7J70ElpH9eoTbkQIkKcF0CYROjKkX0wt0@vger.kernel.org, AJvYcCXbW/Q0e5mSx1eKT0sw8nX+xsILaJpExBMYcYbHtTJW5W3HnvxslXrOa5pFSnHAhSVOpDTmkkgqTes3R+me@vger.kernel.org X-Gm-Message-State: AOJu0YwXA4nWlhUfpnRhPSpN8cZNmMVsiKUnqdz+IJ3XP1OpaLkc9ycU qr/vK8k3Sg9YSTsyb+MGCr96jj+rfH/UqsmtkBkoZANk8OA1C/15 X-Google-Smtp-Source: AGHT+IGIAev7q4EhRphohWsMsUIEQhAipsPoO2zMLEYpKFlAbc/5WIy3Q9fd+3+buaY+vt+c9Fj0cw== X-Received: by 2002:a17:90a:c697:b0:2d8:6f66:1ebf with SMTP id 98e67ed59e1d1-2dbb9e1d090mr13285136a91.20.1726464090813; Sun, 15 Sep 2024 22:21:30 -0700 (PDT) Received: from localhost.localdomain (syn-076-088-006-086.res.spectrum.com. [76.88.6.86]) by smtp.googlemail.com with ESMTPSA id d9443c01a7336-2079470f179sm29624525ad.230.2024.09.15.22.21.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 15 Sep 2024 22:21:30 -0700 (PDT) From: Daniel Yang To: viro@zeniv.linux.org.uk, Namjae Jeon , Sungjong Seo , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Daniel Yang , syzbot+e1c69cadec0f1a078e3d@syzkaller.appspotmail.com Subject: [PATCH v2] fs/exfat: resolve memory leak from exfat_create_upcase_table() Date: Sun, 15 Sep 2024 22:21:27 -0700 Message-Id: <20240916052128.225475-1-danielyangkang@gmail.com> X-Mailer: git-send-email 2.39.2 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" If exfat_load_upcase_table reaches end and returns -EINVAL, allocated memory doesn't get freed and while exfat_load_default_upcase_table allocates more memory, leading to a =20 memory leak. =20 Here's link to syzkaller crash report illustrating this issue: https://syzkaller.appspot.com/text?tag=3DCrashReport&x=3D1406c201980000 Signed-off-by: Daniel Yang Reported-by: syzbot+e1c69cadec0f1a078e3d@syzkaller.appspotmail.com --- V1 -> V2: Moved the mem free to create_upcase_table fs/exfat/nls.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/fs/exfat/nls.c b/fs/exfat/nls.c index afdf13c34..8828f9d29 100644 --- a/fs/exfat/nls.c +++ b/fs/exfat/nls.c @@ -3,6 +3,7 @@ * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. */ =20 +#include #include #include #include @@ -779,8 +780,13 @@ int exfat_create_upcase_table(struct super_block *sb) le32_to_cpu(ep->dentry.upcase.checksum)); =20 brelse(bh); - if (ret && ret !=3D -EIO) + if (ret && ret !=3D -EIO) { + /* free memory from exfat_load_upcase_table call */ + if (ret =3D=3D -EINVAL) { + exfat_free_upcase_table(sbi); + } goto load_default; + } =20 /* load successfully */ return ret; --=20 2.39.2