Hi Shubhankar, Thank you for the patch! Yet something to improve: [auto build test ERROR on net-next/master] [also build test ERROR on linus/master v5.12-rc2 next-20210311] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Shubhankar-Kuranagatti/net-core-... base: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 34bb975126419e86bc3b95e200dc41de6c6ca69c config: x86_64-randconfig-r025-20210311 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 574a9dabc63ba1e7a04c08d4bde2eacd61b44ce1) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # https://github.com/0day-ci/linux/commit/89811231e3ec535f3e5188fb8578535e1... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Shubhankar-Kuranagatti/net-core-datagram-c-Fix-use-of-assignment-in-if-condition/20210311-184120 git checkout 89811231e3ec535f3e5188fb8578535e13c1f1ba # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): len -= copy ^ ; net/core/datagram.c:443:22: error: expected ';' after expression copy = end - offset ^ ; net/core/datagram.c:457:15: error: expected ';' after expression len -= copy ^ ; net/core/datagram.c:477:15: error: expected ';' after expression len -= copy ^ ; net/core/datagram.c:591:15: error: expected ';' after expression len -= copy ^ ; 5 errors generated. vim +430 net/core/datagram.c 406 407 INDIRECT_CALLABLE_DECLARE(static size_t simple_copy_to_iter(const void *addr, 408 size_t bytes, 409 void *data __always_unused, 410 struct iov_iter *i)); 411 412 static int __skb_datagram_iter(const struct sk_buff *skb, int offset, 413 struct iov_iter *to, int len, bool fault_short, 414 size_t (*cb)(const void *, size_t, void *, 415 struct iov_iter *), void *data) 416 { 417 int start = skb_headlen(skb); 418 int i, copy = start - offset, start_off = offset, n; 419 struct sk_buff *frag_iter; 420 421 /* Copy header. */ 422 if (copy > 0) { 423 if (copy > len) 424 copy = len; 425 n = INDIRECT_CALL_1(cb, simple_copy_to_iter, 426 skb->data + offset, copy, data, to); 427 offset += n; 428 if (n != copy) 429 goto short_copy; 431 if ((len) == 0) 432 return 0; 433 } 434 435 /* Copy paged appendix. Hmm... why does this look so complicated? */ 436 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 437 int end; 438 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 439 440 WARN_ON(start > offset + len); 441 442 end = start + skb_frag_size(frag); 443 copy = end - offset 444 if ((copy) > 0) { 445 struct page *page = skb_frag_page(frag); 446 u8 *vaddr = kmap(page); 447 448 if (copy > len) 449 copy = len; 450 n = INDIRECT_CALL_1(cb, simple_copy_to_iter, 451 vaddr + skb_frag_off(frag) + offset - start, 452 copy, data, to); 453 kunmap(page); 454 offset += n; 455 if (n != copy) 456 goto short_copy; 457 len -= copy 458 if (!(len)) 459 return 0; 460 } 461 start = end; 462 } 463 464 skb_walk_frags(skb, frag_iter) { 465 int end; 466 467 WARN_ON(start > offset + len); 468 469 end = start + frag_iter->len; 470 copy = end - offset; 471 if ((copy) > 0) { 472 if (copy > len) 473 copy = len; 474 if (__skb_datagram_iter(frag_iter, offset - start, 475 to, copy, fault_short, cb, data)) 476 goto fault; 477 len -= copy 478 if ((len) == 0) 479 return 0; 480 offset += copy; 481 } 482 start = end; 483 } 484 if (!len) 485 return 0; 486 487 /* This is not really a user copy fault, but rather someone 488 * gave us a bogus length on the skb. We should probably 489 * print a warning here as it may indicate a kernel bug. 490 */ 491 492 fault: 493 iov_iter_revert(to, offset - start_off); 494 return -EFAULT; 495 496 short_copy: 497 if (fault_short || iov_iter_count(to)) 498 goto fault; 499 500 return 0; 501 } 502 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org