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 409C8305E3B; Tue, 21 Jul 2026 22:06:38 +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=1784671599; cv=none; b=POUChvuMeFR93p0fyICT4Y/Z4lpl3Ptbam1xTa5Aka74mETQfkg+GOA3KNJGhLjlyddd8ECoAQR2LI85r/UMtsKhpItAD/m3c0/P+GFD9m/KvFyFnhDemic+dltVf+ERniW1ZhEp31ltJmOkss7AkqTW8J1c9hRPPtkH/9d/mR4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784671599; c=relaxed/simple; bh=DIrEF4exXhWr1H6CJUFc3we1tEBDqZOcuIoPD7bPQZM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=F9kcDft/Fo6W+Pc7Ot5CYDvrgWUQFnawGbXnqoJ/Dy+ex5oBmFuiFGgrQYRPcCO4JQrsQ042Y0yCzzSpk2NOaB7w63b5shAw+PgK+6fho3K3zzWDTU+A5YkuBecv/TKOuDYqRAgrN1rsiRJhIfaJZQ2C4WZXkptcelOFZsVizB4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=lDYnD+s9; 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="lDYnD+s9" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A5E7D1F000E9; Tue, 21 Jul 2026 22:06:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784671598; bh=P3G6UCWtqLSd1KkSfrNkR+PUr++75yseOKNaaGM6hBA=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=lDYnD+s9+vWphTukZt3Rn2BMXpn1NoQjfCyAwhOQh87OW92uB6rud05uzRTlRLEqr sKMM3iXBcY7maTLWJ2g3mplsDBai1Khq4ZqMmUSSap2yRtYkZbSQQTQ/FYjIyPqMMH O6fSivZpO9gXjfwlPt/8ONcocwhvxgvTbCwIa7XU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jacob Moroni , Jason Gunthorpe , Sasha Levin Subject: [PATCH 5.15 305/843] RDMA/irdma: Fix OOB read during CQ MR registration Date: Tue, 21 Jul 2026 17:19:00 +0200 Message-ID: <20260721152412.888976356@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152405.946368001@linuxfoundation.org> References: <20260721152405.946368001@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: Jacob Moroni [ Upstream commit 4385ddd654d90245eeb83b3cb539670ab5c85ba4 ] Sashiko pointed out an unrelated bug during a previous patch: https://sashiko.dev/#/patchset/20260512183852.614045-1-jmoroni%40google.com This change fixes the bug by eliminating the cqmr->split field which was not being set properly and instead just checks the CQ resize feature flag directly. The cqmr->split field essentially tracks whether IRDMA_FEATURE_CQ_RESIZE is set, but it was not being set until CQ creation time, which is _after_ CQ memory registration (the only other place where it is referenced). As a result, it would always be false during MR registration and would therefore cause irdma_handle_q_mem to populate cqmr->shadow even for GEN_2 HW and beyond: cqmr->shadow = (dma_addr_t)arr[req->cq_pages]; The issue is that for GEN_2 and beyond, req->cq_pages may be exactly equal to iwmr->page_cnt and therefore equal to the size of arr, which would cause an OOB read by one. Fixes: b48c24c2d710 ("RDMA/irdma: Implement device supported verb APIs") Link: https://patch.msgid.link/r/20260602214423.1315105-2-jmoroni@google.com Signed-off-by: Jacob Moroni Signed-off-by: Jason Gunthorpe Signed-off-by: Sasha Levin --- drivers/infiniband/hw/irdma/verbs.c | 4 ++-- drivers/infiniband/hw/irdma/verbs.h | 1 - 2 files changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/infiniband/hw/irdma/verbs.c b/drivers/infiniband/hw/irdma/verbs.c index f6409fa1d33b82..e6cf2734c684a8 100644 --- a/drivers/infiniband/hw/irdma/verbs.c +++ b/drivers/infiniband/hw/irdma/verbs.c @@ -2024,7 +2024,6 @@ static int irdma_create_cq(struct ib_cq *ibcq, } cqmr_shadow = &iwpbl_shadow->cq_mr; info.shadow_area_pa = cqmr_shadow->cq_pbl.addr; - cqmr->split = true; } else { info.shadow_area_pa = cqmr->shadow; } @@ -2400,7 +2399,8 @@ static int irdma_handle_q_mem(struct irdma_device *iwdev, case IRDMA_MEMREG_TYPE_CQ: hmc_p = &cqmr->cq_pbl; - if (!cqmr->split) + if (!(iwdev->rf->sc_dev.hw_attrs.uk_attrs.feature_flags & + IRDMA_FEATURE_CQ_RESIZE)) cqmr->shadow = (dma_addr_t)arr[req->cq_pages]; if (use_pbles) diff --git a/drivers/infiniband/hw/irdma/verbs.h b/drivers/infiniband/hw/irdma/verbs.h index 13c66908411f75..9604d9dc2784c0 100644 --- a/drivers/infiniband/hw/irdma/verbs.h +++ b/drivers/infiniband/hw/irdma/verbs.h @@ -56,7 +56,6 @@ struct irdma_hmc_pble { struct irdma_cq_mr { struct irdma_hmc_pble cq_pbl; dma_addr_t shadow; - bool split; }; struct irdma_qp_mr { -- 2.53.0