tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 06a81c1c7db9bd5de0bd38cd5acc44bb22b99150 commit: ec4b0925089826af45e99cdf78a8ac84c1d005f1 NFS: inter ssc open date: 10 months ago config: openrisc-randconfig-m031-20200809 (attached as .config) compiler: or1k-linux-gcc (GCC) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; smatch warnings: fs/nfs/nfs4file.c:347 nfs42_ssc_open() error: potential null dereference 'ctx'. (alloc_nfs_open_context returns null) vim +/ctx +347 fs/nfs/nfs4file.c 293 294 struct file * 295 nfs42_ssc_open(struct vfsmount *ss_mnt, struct nfs_fh *src_fh, 296 nfs4_stateid *stateid) 297 { 298 struct nfs_fattr fattr; 299 struct file *filep, *res; 300 struct nfs_server *server; 301 struct inode *r_ino = NULL; 302 struct nfs_open_context *ctx; 303 struct nfs4_state_owner *sp; 304 char *read_name; 305 int len, status = 0; 306 307 server = NFS_SERVER(ss_mnt->mnt_root->d_inode); 308 309 nfs_fattr_init(&fattr); 310 311 status = nfs4_proc_getattr(server, src_fh, &fattr, NULL, NULL); 312 if (status < 0) { 313 res = ERR_PTR(status); 314 goto out; 315 } 316 317 res = ERR_PTR(-ENOMEM); 318 len = strlen(SSC_READ_NAME_BODY) + 16; 319 read_name = kzalloc(len, GFP_NOFS); 320 if (read_name == NULL) 321 goto out; 322 snprintf(read_name, len, SSC_READ_NAME_BODY, read_name_gen++); 323 324 r_ino = nfs_fhget(ss_mnt->mnt_root->d_inode->i_sb, src_fh, &fattr, 325 NULL); 326 if (IS_ERR(r_ino)) { 327 res = ERR_CAST(r_ino); 328 goto out; 329 } 330 331 filep = alloc_file_pseudo(r_ino, ss_mnt, read_name, FMODE_READ, 332 r_ino->i_fop); 333 if (IS_ERR(filep)) { 334 res = ERR_CAST(filep); 335 goto out; 336 } 337 filep->f_mode |= FMODE_READ; 338 339 ctx = alloc_nfs_open_context(filep->f_path.dentry, filep->f_mode, 340 filep); 341 if (IS_ERR(ctx)) { 342 res = ERR_CAST(ctx); 343 goto out_filep; 344 } 345 346 res = ERR_PTR(-EINVAL); 348 if (sp == NULL) 349 goto out_ctx; 350 351 ctx->state = nfs4_get_open_state(r_ino, sp); 352 if (ctx->state == NULL) 353 goto out_stateowner; 354 355 set_bit(NFS_OPEN_STATE, &ctx->state->flags); 356 memcpy(&ctx->state->open_stateid.other, &stateid->other, 357 NFS4_STATEID_OTHER_SIZE); 358 update_open_stateid(ctx->state, stateid, NULL, filep->f_mode); 359 360 nfs_file_set_open_context(filep, ctx); 361 put_nfs_open_context(ctx); 362 363 file_ra_state_init(&filep->f_ra, filep->f_mapping->host->i_mapping); 364 res = filep; 365 out: 366 return res; 367 out_stateowner: 368 nfs4_put_state_owner(sp); 369 out_ctx: 370 put_nfs_open_context(ctx); 371 out_filep: 372 fput(filep); 373 goto out; 374 } 375 EXPORT_SYMBOL_GPL(nfs42_ssc_open); 376 void nfs42_ssc_close(struct file *filep) 377 { 378 struct nfs_open_context *ctx = nfs_file_open_context(filep); 379 380 ctx->state->flags = 0; 381 } 382 EXPORT_SYMBOL_GPL(nfs42_ssc_close); 383 #endif /* CONFIG_NFS_V4_2 */ 384 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org