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Mon, 02 Jun 2025 01:57:23 -0700 (PDT) From: Anastasia Belova To: Ilya Maximets Cc: Anastasia Belova , Jason Wang , qemu-devel@nongnu.org, sdl.qemu@linuxtesting.org Subject: [PATCH] net: fix buffer overflow in af_xdp_umem_create() Date: Mon, 2 Jun 2025 11:57:17 +0300 Message-ID: <20250602085719.5058-1-nabelova31@gmail.com> X-Mailer: git-send-email 2.47.0 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::22b; envelope-from=nabelova31@gmail.com; helo=mail-lj1-x22b.google.com X-Spam_score_int: -17 X-Spam_score: -1.8 X-Spam_bar: - X-Spam_report: (-1.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1748854670407116600 Content-Type: text/plain; charset="utf-8" s->pool has n_descs elements so maximum i should be n_descs - 1. Fix the upper bound. Found by Linux Verification Center (linuxtesting.org) with SVACE. Fixes: cb039ef3d9 ("net: add initial support for AF_XDP network backend") Signed-off-by: Anastasia Belova Reviewed-by: Ilya Maximets --- net/af-xdp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/af-xdp.c b/net/af-xdp.c index 01c5fb914e..d022534d76 100644 --- a/net/af-xdp.c +++ b/net/af-xdp.c @@ -323,7 +323,7 @@ static int af_xdp_umem_create(AFXDPState *s, int sock_f= d, Error **errp) =20 s->pool =3D g_new(uint64_t, n_descs); /* Fill the pool in the opposite order, because it's a LIFO queue. */ - for (i =3D n_descs; i >=3D 0; i--) { + for (i =3D n_descs - 1; i >=3D 0; i--) { s->pool[i] =3D i * XSK_UMEM__DEFAULT_FRAME_SIZE; } s->n_pool =3D n_descs; --=20 2.47.0