diff -r cd74667f6c85 -r 4adad7faf452 src/server/daemon/vfs.c
--- a/src/server/daemon/vfs.c	Sat Jan 25 15:34:30 2020 +0100
+++ b/src/server/daemon/vfs.c	Sat Jan 25 21:37:38 2020 +0100
@@ -99,6 +99,9 @@
     WS_ASSERT(rq);
     
     VFSContext *ctx = pool_malloc(sn->pool, sizeof(VFSContext));
+    if(!ctx) {
+        return NULL;
+    }
     ctx->sn = sn;
     ctx->rq = rq;
     ctx->vfs = rq->vfs ? rq->vfs : &sys_vfs;
@@ -110,7 +113,7 @@
     return ctx;
 }
 
-SYS_FILE vfs_open(VFSContext *ctx, char *path, int oflags) {
+SYS_FILE vfs_open(VFSContext *ctx, const char *path, int oflags) {
     WS_ASSERT(ctx);
     WS_ASSERT(path);
     
@@ -131,19 +134,19 @@
     return file;
 }
 
-SYS_FILE vfs_openRO(VFSContext *ctx, char *path) {
+SYS_FILE vfs_openRO(VFSContext *ctx, const char *path) {
     return vfs_open(ctx, path, O_RDONLY);
 }
 
-SYS_FILE vfs_openWO(VFSContext *ctx, char *path) {
+SYS_FILE vfs_openWO(VFSContext *ctx, const char *path) {
     return vfs_open(ctx, path, O_WRONLY | O_CREAT);
 }
 
-SYS_FILE vfs_openRW(VFSContext *ctx, char *path) {
+SYS_FILE vfs_openRW(VFSContext *ctx, const char *path) {
     return vfs_open(ctx, path, O_RDONLY | O_WRONLY | O_CREAT);
 }
 
-int vfs_stat(VFSContext *ctx, char *path, struct stat *buf) {
+int vfs_stat(VFSContext *ctx, const char *path, struct stat *buf) {
     WS_ASSERT(ctx);
     WS_ASSERT(path);
     
@@ -183,7 +186,7 @@
     }
 }
 
-VFS_DIR vfs_opendir(VFSContext *ctx, char *path) {
+VFS_DIR vfs_opendir(VFSContext *ctx, const char *path) {
     WS_ASSERT(ctx);
     WS_ASSERT(path);
     
@@ -250,14 +253,14 @@
     }
 }
 
-int vfs_mkdir(VFSContext *ctx, char *path) {
+int vfs_mkdir(VFSContext *ctx, const char *path) {
     WS_ASSERT(ctx);
     WS_ASSERT(path);
     
     return vfs_path_op(ctx, path, ctx->vfs->mkdir, ACL_ADD_FILE);
 }
 
-int vfs_unlink(VFSContext *ctx, char *path) {
+int vfs_unlink(VFSContext *ctx, const char *path) {
     WS_ASSERT(ctx);
     WS_ASSERT(path);
     
@@ -266,7 +269,7 @@
 
 
 // private
-int vfs_path_op(VFSContext *ctx, char *path, vfs_op_f op, uint32_t access) {  
+int vfs_path_op(VFSContext *ctx, const char *path, vfs_op_f op, uint32_t access) {  
     uint32_t access_mask = ctx->aclreqaccess;
     access_mask |= access;
     
@@ -287,7 +290,7 @@
 
 /* system vfs implementation */
 
-SYS_FILE sys_vfs_open(VFSContext *ctx, char *path, int oflags) {
+SYS_FILE sys_vfs_open(VFSContext *ctx, const char *path, int oflags) {
     uint32_t access_mask = ctx->aclreqaccess;
     pool_handle_t *pool = ctx->pool;
     
@@ -336,7 +339,7 @@
     return file;
 }
 
-int sys_vfs_stat(VFSContext *ctx, char *path, struct stat *buf) {
+int sys_vfs_stat(VFSContext *ctx, const char *path, struct stat *buf) {
     uint32_t access_mask = ctx->aclreqaccess;
     
     // check ACLs
@@ -376,7 +379,7 @@
     return 0;
 }
 
-VFS_DIR sys_vfs_opendir(VFSContext *ctx, char *path) {
+VFS_DIR sys_vfs_opendir(VFSContext *ctx, const char *path) {
     uint32_t access_mask = ctx->aclreqaccess;
     pool_handle_t *pool = ctx->pool;
     
@@ -501,16 +504,16 @@
     return dir;
 }
 
-int sys_vfs_mkdir(VFSContext *ctx, char *path) {
+int sys_vfs_mkdir(VFSContext *ctx, const char *path) {
     return sys_path_op(ctx, path, sys_mkdir);
 }
 
-int sys_vfs_unlink(VFSContext *ctx, char *path) {
+int sys_vfs_unlink(VFSContext *ctx, const char *path) {
     return sys_path_op(ctx, path, sys_unlink);
 }
 
 
-int sys_path_op(VFSContext *ctx, char *path, sys_op_f op) {
+int sys_path_op(VFSContext *ctx, const char *path, sys_op_f op) {
     uint32_t access_mask = ctx->aclreqaccess;
     
     // check ACLs
@@ -647,7 +650,7 @@
     }
 }
 
-int sys_mkdir(VFSContext *ctx, char *path, SysACL *sysacl) {
+int sys_mkdir(VFSContext *ctx, const char *path, SysACL *sysacl) {
     mode_t mode = S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;
     int ret = mkdir(path, mode);
     if(ret == 0) {
@@ -660,7 +663,7 @@
     return ret;
 }
 
-int sys_unlink(VFSContext *ctx, char *path, SysACL *sysacl) {
+int sys_unlink(VFSContext *ctx, const char *path, SysACL *sysacl) {
     return unlink(path);
 }