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 76E4D3AC0D9; Sat, 12 Sep 2026 18:30:59 +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=1789237860; cv=none; b=cTRvvI07iGu7AyY+yyQVgjogbkaeCVaj1S4GGtL35mzsYVMIyYbrpNAto7yIE8cvxt0U8AKrwI8jioxtqQBUJn7b8cnC7/9tqW0WPWvstSoHhaXI+d8cDODP9bbiZe4TKpOl5sle7NgHy1tL25hUEZ5nly2truJfj0R87OfRvQI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789237860; c=relaxed/simple; bh=BlLidSiJJTALs7j72M4C7/NLG9HwDfldaM2VEPo/p38=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=DBt9MVWl4AyK1GyMdKZz1PKl8dJSNFvQ7b3bSXzOxLFj4DLKrziJ0s5YDUGz5TME2v4HCEWUOBRA05U4LdIVWv9qrazQcmox6utSBHz+8VbMk1EbKouEjywhs7lDu8iyBn85rHiwdH2M/UgLAAnlfrRBNcdWbuNQsLPfw4gpLUA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=bONtP/Is; 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="bONtP/Is" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 302B01F00893; Sat, 12 Sep 2026 18:30:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789237859; bh=JUKFAkrqJ978uE3beWRqtk0n9DJN9NqjFsHrboq0zz4=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=bONtP/IsJWCVVt7QtBY2utc2BGB7FgFe8+1BRr8snltYmxlmXiYIyrhg+kpz///ma LoSLxAVYZg+TTY6IPp8sh6I5UZdnqVQmhqzZlgHyYfpAopA4l9eLqM2VESZcB36Zv9 wETVTuV2mG3pwlXDUIptgtyvEJSDiIH40U+EFybc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Sashiko , Nilesh Javali , "Martin K. Petersen (Oracle)" Subject: [PATCH 5.15 343/935] scsi: qla2xxx: Fix FCE trace use-after-free during firmware dump Date: Sat, 12 Sep 2026 08:56:13 +0200 Message-ID: <20260912065534.674516150@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260912065526.833703348@linuxfoundation.org> References: <20260912065526.833703348@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 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Nilesh Javali commit 53298efcbbb0f0438366d45cb7ed7e6d93dd5531 upstream. qla2x00_free_fce_trace() freed and cleared ha->fce while holding only fce_mutex. The firmware-dump consumers qla27xx_fwdt_entry_t264() and qla25xx_copy_fce() read ha->fce (NULL check followed by a copy of the buffer) under hardware_lock and never take fce_mutex. A debugfs FCE disable could therefore free the DMA buffer between a dump's NULL check and its copy, resulting in a use-after-free. Unpublish ha->fce under hardware_lock, then release the lock and free the DMA buffer (dma_free_coherent() may sleep). A concurrent dump either completes its check and copy with the buffer still valid, or observes ha->fce == NULL and skips it. Fixes: 841df27d619e ("scsi: qla2xxx: Move FCE Trace buffer allocation to user control") Cc: stable@vger.kernel.org Reported-by: Sashiko Signed-off-by: Nilesh Javali Link: https://patch.msgid.link/20260730155838.2119230-11-njavali@marvell.com Signed-off-by: Martin K. Petersen (Oracle) Signed-off-by: Greg Kroah-Hartman --- drivers/scsi/qla2xxx/qla_init.c | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) --- a/drivers/scsi/qla2xxx/qla_init.c +++ b/drivers/scsi/qla2xxx/qla_init.c @@ -3770,11 +3770,27 @@ int qla2x00_alloc_fce_trace(scsi_qla_hos void qla2x00_free_fce_trace(struct qla_hw_data *ha) { - if (!ha->fce) + void *fce; + dma_addr_t fce_dma; + unsigned long flags; + + /* + * Unpublish ha->fce under hardware_lock so a firmware dump in + * progress (which reads ha->fce under the same lock) cannot race + * with the buffer being freed. + */ + spin_lock_irqsave(&ha->hardware_lock, flags); + if (!ha->fce) { + spin_unlock_irqrestore(&ha->hardware_lock, flags); return; - dma_free_coherent(&ha->pdev->dev, FCE_SIZE, ha->fce, ha->fce_dma); + } + fce = ha->fce; + fce_dma = ha->fce_dma; ha->fce = NULL; ha->fce_dma = 0; + spin_unlock_irqrestore(&ha->hardware_lock, flags); + + dma_free_coherent(&ha->pdev->dev, FCE_SIZE, fce, fce_dma); } static void