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Thu, 12 Dec 2019 16:40:54 +0000 (UTC) From: "Dr. David Alan Gilbert (git)" To: qemu-devel@nongnu.org, stefanha@redhat.com, vgoyal@redhat.com Subject: [PATCH 072/104] virtiofsd: passthrough_ll: fix refcounting on remove/rename Date: Thu, 12 Dec 2019 16:38:32 +0000 Message-Id: <20191212163904.159893-73-dgilbert@redhat.com> In-Reply-To: <20191212163904.159893-1-dgilbert@redhat.com> References: <20191212163904.159893-1-dgilbert@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-MC-Unique: HKNKaFOoOAKgiAevhu-MHw-1 X-Mimecast-Spam-Score: 0 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 207.211.31.120 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" From: Miklos Szeredi Signed-off-by: Miklos Szeredi --- tools/virtiofsd/passthrough_ll.c | 50 +++++++++++++++++++++++++++++++- 1 file changed, 49 insertions(+), 1 deletion(-) diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthrough_ll.c index 0f33c3c5e9..1b84d4f313 100644 --- a/tools/virtiofsd/passthrough_ll.c +++ b/tools/virtiofsd/passthrough_ll.c @@ -1077,17 +1077,42 @@ out_err: fuse_reply_err(req, saverr); } +static struct lo_inode *lookup_name(fuse_req_t req, fuse_ino_t parent, + const char *name) +{ + int res; + struct stat attr; + + res = fstatat(lo_fd(req, parent), name, &attr, + AT_EMPTY_PATH | AT_SYMLINK_NOFOLLOW); + if (res == -1) { + return NULL; + } + + return lo_find(lo_data(req), &attr); +} + static void lo_rmdir(fuse_req_t req, fuse_ino_t parent, const char *name) { int res; + struct lo_inode *inode; + struct lo_data *lo = lo_data(req); + if (!is_safe_path_component(name)) { fuse_reply_err(req, EINVAL); return; } + inode = lookup_name(req, parent, name); + if (!inode) { + fuse_reply_err(req, EIO); + return; + } + res = unlinkat(lo_fd(req, parent), name, AT_REMOVEDIR); fuse_reply_err(req, res == -1 ? errno : 0); + unref_inode_lolocked(lo, inode, 1); } static void lo_rename(fuse_req_t req, fuse_ino_t parent, const char *name, @@ -1095,12 +1120,23 @@ static void lo_rename(fuse_req_t req, fuse_ino_t parent, const char *name, unsigned int flags) { int res; + struct lo_inode *oldinode; + struct lo_inode *newinode; + struct lo_data *lo = lo_data(req); if (!is_safe_path_component(name) || !is_safe_path_component(newname)) { fuse_reply_err(req, EINVAL); return; } + oldinode = lookup_name(req, parent, name); + newinode = lookup_name(req, newparent, newname); + + if (!oldinode) { + fuse_reply_err(req, EIO); + goto out; + } + if (flags) { #ifndef SYS_renameat2 fuse_reply_err(req, EINVAL); @@ -1113,26 +1149,38 @@ static void lo_rename(fuse_req_t req, fuse_ino_t parent, const char *name, fuse_reply_err(req, res == -1 ? errno : 0); } #endif - return; + goto out; } res = renameat(lo_fd(req, parent), name, lo_fd(req, newparent), newname); fuse_reply_err(req, res == -1 ? errno : 0); +out: + unref_inode_lolocked(lo, oldinode, 1); + unref_inode_lolocked(lo, newinode, 1); } static void lo_unlink(fuse_req_t req, fuse_ino_t parent, const char *name) { int res; + struct lo_inode *inode; + struct lo_data *lo = lo_data(req); if (!is_safe_path_component(name)) { fuse_reply_err(req, EINVAL); return; } + inode = lookup_name(req, parent, name); + if (!inode) { + fuse_reply_err(req, EIO); + return; + } + res = unlinkat(lo_fd(req, parent), name, 0); fuse_reply_err(req, res == -1 ? errno : 0); + unref_inode_lolocked(lo, inode, 1); } static void unref_inode_lolocked(struct lo_data *lo, struct lo_inode *inode,