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 04BB33A542F; Sat, 30 May 2026 17:30:19 +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=1780162220; cv=none; b=giE/QKzPhDBVlIxPk46KZvehWzZBj9MnuMckLcsk1yMEAoIm1wwOAfmLY3nk6jAYquBrS2hz47zQFQfZ+fWTW/zzmWBjTEpX6OYXIlj6RcLPNHzAxW6bRXbL5ZoS8xL/wHFXThU/2aMsVse0SusAC/lyYyYngQ8DisXxRtzlLz4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780162220; c=relaxed/simple; bh=p7jkk3vnsDFGMmhVxKCsTlZFPE9Hbkpz2G6XdhwsN/k=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=U42/LDMY1c2lL6PdtrfaqRTQiBTwcKOWopT3LbYJpbikZnjPBuvBbWddYxG28FdrqkiOwmjCKj4/5kNCuQqJuTA0wtXipIcA1YbEx30beDwRJ9NDO9EywlA3a9FaH/eqaGVZsi5GCTt5bXUXyJOpsmHNmmsTe4XCeaBiNgSrB78= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=CP34Ay90; 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="CP34Ay90" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4CD761F00893; Sat, 30 May 2026 17:30:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1780162218; bh=tDy9bMhLsMOKu7AsfGUpNi5ZfGWL1W6q1BO2rhT6QnU=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=CP34Ay90UnkI6KOMDT4uVFhGoikdcQlxZH7xmy1D59Ax4UcWnaat3hqI0HtetvCAN mGgorPBViVeyFCs5g6szA3iH2HBsDdDoIjrLK9/DzpbKcjbyfUEWsLqsTeSZFrRLFh bEY/FrAjz7W2Ug4tF7DiN39fP5X8Tn9V1vtZi7lk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Zilin Guan , Dawei Feng , Jakub Kicinski Subject: [PATCH 6.1 855/969] qed: fix double free in qed_cxt_tables_alloc() Date: Sat, 30 May 2026 18:06:19 +0200 Message-ID: <20260530160324.278547804@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260530160300.485627683@linuxfoundation.org> References: <20260530160300.485627683@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Dawei Feng commit 2bccfb8476ca5f3548afbd623dc7a6980d4e77de upstream. If one of the later PF or VF CID bitmap allocations fails, qed_cid_map_alloc() jumps to cid_map_fail and frees the previously allocated CID bitmaps before returning an error. qed_cxt_tables_alloc() then calls qed_cxt_mngr_free(), which invokes qed_cid_map_free() again. Fix this by setting each CID bitmap pointer to NULL after bitmap_free() to avoid double free. The bug was first flagged by an experimental analysis tool we are developing for kernel memory-management bugs while analyzing v6.13-rc1. The tool is still under development and is not yet publicly available. Manual inspection confirms that the bug is still present in v7.1-rc3. Runtime reproduction was not attempted because exercising the failing allocation path requires device-specific setup. Fixes: fe56b9e6a8d9 ("qed: Add module with basic common support") Cc: stable@vger.kernel.org Signed-off-by: Zilin Guan Signed-off-by: Dawei Feng Link: https://patch.msgid.link/20260520070323.2762379-1-dawei.feng@seu.edu.cn Signed-off-by: Jakub Kicinski Signed-off-by: Greg Kroah-Hartman --- drivers/net/ethernet/qlogic/qed/qed_cxt.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/net/ethernet/qlogic/qed/qed_cxt.c +++ b/drivers/net/ethernet/qlogic/qed/qed_cxt.c @@ -1038,11 +1038,13 @@ static void qed_cid_map_free(struct qed_ for (type = 0; type < MAX_CONN_TYPES; type++) { bitmap_free(p_mngr->acquired[type].cid_map); + p_mngr->acquired[type].cid_map = NULL; p_mngr->acquired[type].max_count = 0; p_mngr->acquired[type].start_cid = 0; for (vf = 0; vf < MAX_NUM_VFS; vf++) { bitmap_free(p_mngr->acquired_vf[type][vf].cid_map); + p_mngr->acquired_vf[type][vf].cid_map = NULL; p_mngr->acquired_vf[type][vf].max_count = 0; p_mngr->acquired_vf[type][vf].start_cid = 0; }