From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 61CF21F09A5; Wed, 17 Sep 2025 12:36:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758112590; cv=none; b=BK9NZ44YzXTn0HB6kjQUvIGa2Gy9zyhGnfNuIEDTXwA6sMg1e+z7wLLedq//1M8HuQ423buuHtlnE+q1SLUoYoUpbHq3vk0IqCm+ZiIW7+2of/6dS+NIIWp3bv/EIjrWt4FGSynOl8rUOnvTp32jyyspK0ddz2sYjqLeDWx4dxg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758112590; c=relaxed/simple; bh=BaZ6hsZS6zCTFxR2HBwUr0Q5cwm7n8BD3O+PcuUmACE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=UHaGFH5tlVO96HFllYA0MXz1QTC1sn8XFoPWm5c552t/w+FYhUC1fNYVTxhGPNY855piZvKnpKzYw+wmfC63xeoIKaYRZjsFkZgUy3YdeZ81aaulcu231WBSDMCxtpWZ0wxZezsETlX6ANFb0PrhxlVbm+4e9Vab9bT9mi4kTnU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=cq+1HL4/; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="cq+1HL4/" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 91F3FC4CEF0; Wed, 17 Sep 2025 12:36:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1758112590; bh=BaZ6hsZS6zCTFxR2HBwUr0Q5cwm7n8BD3O+PcuUmACE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cq+1HL4/91dA5kSSjIo2WuKtUJKIzFYW2fmYCdQzYtUtA5dF3VoII6oWr1DyOassh 8DRt8b04h926eL+Rz0L8ovBIjyeRn5oxwb3zfu5+Rzfqn8PIHVpbshL62v8NDAPpaO p8vBJUaMzPGzgXXzalx/wffrvzN3ae4bwTF4LDR8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Dan Carpenter , Tigran Mkrtchyan , Trond Myklebust , Sasha Levin Subject: [PATCH 6.16 017/189] flexfiles/pNFS: fix NULL checks on result of ff_layout_choose_ds_for_read Date: Wed, 17 Sep 2025 14:32:07 +0200 Message-ID: <20250917123352.272969398@linuxfoundation.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250917123351.839989757@linuxfoundation.org> References: <20250917123351.839989757@linuxfoundation.org> User-Agent: quilt/0.68 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 6.16-stable review patch. If anyone has any objections, please let me know. ------------------ From: Tigran Mkrtchyan [ Upstream commit 5a46d2339a5ae268ede53a221f20433d8ea4f2f9 ] Recent commit f06bedfa62d5 ("pNFS/flexfiles: don't attempt pnfs on fatal DS errors") has changed the error return type of ff_layout_choose_ds_for_read() from NULL to an error pointer. However, not all code paths have been updated to match the change. Thus, some non-NULL checks will accept error pointers as a valid return value. Reported-by: Dan Carpenter Suggested-by: Dan Carpenter Fixes: f06bedfa62d5 ("pNFS/flexfiles: don't attempt pnfs on fatal DS errors") Signed-off-by: Tigran Mkrtchyan Signed-off-by: Trond Myklebust Signed-off-by: Sasha Levin --- fs/nfs/flexfilelayout/flexfilelayout.c | 19 ++++++++++++------- 1 file changed, 12 insertions(+), 7 deletions(-) diff --git a/fs/nfs/flexfilelayout/flexfilelayout.c b/fs/nfs/flexfilelayout/flexfilelayout.c index 8dc921d835388..f8ab7b4e09e7e 100644 --- a/fs/nfs/flexfilelayout/flexfilelayout.c +++ b/fs/nfs/flexfilelayout/flexfilelayout.c @@ -773,8 +773,11 @@ ff_layout_choose_ds_for_read(struct pnfs_layout_segment *lseg, continue; if (check_device && - nfs4_test_deviceid_unavailable(&mirror->mirror_ds->id_node)) + nfs4_test_deviceid_unavailable(&mirror->mirror_ds->id_node)) { + // reinitialize the error state in case if this is the last iteration + ds = ERR_PTR(-EINVAL); continue; + } *best_idx = idx; break; @@ -804,7 +807,7 @@ ff_layout_choose_best_ds_for_read(struct pnfs_layout_segment *lseg, struct nfs4_pnfs_ds *ds; ds = ff_layout_choose_valid_ds_for_read(lseg, start_idx, best_idx); - if (ds) + if (!IS_ERR(ds)) return ds; return ff_layout_choose_any_ds_for_read(lseg, start_idx, best_idx); } @@ -818,7 +821,7 @@ ff_layout_get_ds_for_read(struct nfs_pageio_descriptor *pgio, ds = ff_layout_choose_best_ds_for_read(lseg, pgio->pg_mirror_idx, best_idx); - if (ds || !pgio->pg_mirror_idx) + if (!IS_ERR(ds) || !pgio->pg_mirror_idx) return ds; return ff_layout_choose_best_ds_for_read(lseg, 0, best_idx); } @@ -868,7 +871,7 @@ ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio, req->wb_nio = 0; ds = ff_layout_get_ds_for_read(pgio, &ds_idx); - if (!ds) { + if (IS_ERR(ds)) { if (!ff_layout_no_fallback_to_mds(pgio->pg_lseg)) goto out_mds; pnfs_generic_pg_cleanup(pgio); @@ -1072,11 +1075,13 @@ static void ff_layout_resend_pnfs_read(struct nfs_pgio_header *hdr) { u32 idx = hdr->pgio_mirror_idx + 1; u32 new_idx = 0; + struct nfs4_pnfs_ds *ds; - if (ff_layout_choose_any_ds_for_read(hdr->lseg, idx, &new_idx)) - ff_layout_send_layouterror(hdr->lseg); - else + ds = ff_layout_choose_any_ds_for_read(hdr->lseg, idx, &new_idx); + if (IS_ERR(ds)) pnfs_error_mark_layout_for_return(hdr->inode, hdr->lseg); + else + ff_layout_send_layouterror(hdr->lseg); pnfs_read_resend_pnfs(hdr, new_idx); } -- 2.51.0