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[213.67.3.247]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-52e7ab27b8csm1586825e87.139.2024.07.01.15.44.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 01 Jul 2024 15:44:25 -0700 (PDT) From: "Edgar E. Iglesias" To: qemu-devel@nongnu.org Cc: sstabellini@kernel.org, anthony@xenproject.org, paul@xen.org, edgar.iglesias@amd.com, xen-devel@lists.xenproject.org, Anthony PERARD Subject: [PATCH v1 2/2] xen: mapcache: Fix unmapping of first entries in buckets Date: Tue, 2 Jul 2024 00:44:21 +0200 Message-ID: <20240701224421.1432654-3-edgar.iglesias@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240701224421.1432654-1-edgar.iglesias@gmail.com> References: <20240701224421.1432654-1-edgar.iglesias@gmail.com> MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::12d; envelope-from=edgar.iglesias@gmail.com; helo=mail-lf1-x12d.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 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_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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: "Edgar E. Iglesias" This fixes the clobbering of the entry->next pointer when unmapping the first entry in a bucket of a mapcache. Fixes: 123acd816d ("xen: mapcache: Unmap first entries in buckets") Reported-by: Anthony PERARD Signed-off-by: Edgar E. Iglesias Reviewed-by: Anthony PERARD Reviewed-by: Stefano Stabellini --- hw/xen/xen-mapcache.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/hw/xen/xen-mapcache.c b/hw/xen/xen-mapcache.c index 5f23b0adbe..18ba7b1d8f 100644 --- a/hw/xen/xen-mapcache.c +++ b/hw/xen/xen-mapcache.c @@ -597,7 +597,17 @@ static void xen_invalidate_map_cache_entry_unlocked(MapCache *mc, pentry->next = entry->next; g_free(entry); } else { - memset(entry, 0, sizeof *entry); + /* + * Invalidate mapping but keep entry->next pointing to the rest + * of the list. + * + * Note that lock is already zero here, otherwise we don't unmap. + */ + entry->paddr_index = 0; + entry->vaddr_base = NULL; + entry->valid_mapping = NULL; + entry->flags = 0; + entry->size = 0; } }