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(4f.55.790d.ip4.static.sl-reverse.com. [13.121.85.79]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-91ef04e7315sm18569186d6.22.2026.11.10.03.23.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 Nov 2026 03:23:29 -0800 (PST) From: Alex Markuze To: "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: Simon Horman , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH net-next 1/4] net: preserve splice iterator progress on rejection Date: Tue, 10 Nov 2026 11:23:22 +0000 Message-Id: <20261110112325.3263078-2-amarkuze@redhat.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20261110112325.3263078-1-amarkuze@redhat.com> References: <20261110112325.3263078-1-amarkuze@redhat.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit When the iterator is nonempty and the maximum length is zero, the generic extraction path reports -EIO instead of performing a no-op. Return zero before attempting extraction. The extractor advances the iterator before checking whether the pages can be sent. If a page is rejected, revert the unappended extraction remainder, as the fragment-append failure path already does. This keeps an accepted prefix and leaves the rejected suffix available to the caller. Fixes: 2e910b95329c ("net: Add a function to splice pages into an skbuff for MSG_SPLICE_PAGES") Signed-off-by: Alex Markuze --- net/core/skbuff.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 48f676411724..ee7a1bc72cc2 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -7554,6 +7554,9 @@ ssize_t skb_splice_from_iter(struct sk_buff *skb, struct iov_iter *iter, ssize_t spliced = 0, ret = 0; unsigned int i; + if (!maxsize) + return 0; + while (iter->count > 0) { ssize_t space, nr, len; size_t off; @@ -7578,8 +7581,10 @@ ssize_t skb_splice_from_iter(struct sk_buff *skb, struct iov_iter *iter, size_t part = min_t(size_t, PAGE_SIZE - off, len); ret = -EIO; - if (WARN_ON_ONCE(!sendpage_ok(page))) + if (WARN_ON_ONCE(!sendpage_ok(page))) { + iov_iter_revert(iter, len); goto out; + } ret = skb_append_pagefrags(skb, page, off, part, frag_limit); base-commit: 4dd16e31135ea8437a720222df34e8745f385d6d -- 2.34.1