Hi Takashi, [auto build test WARNING on v4.6-rc1] [also build test WARNING on next-20160331] [if your patch is applied to the wrong git tree, please drop us a note to help improving the system]
url: https://github.com/0day-ci/linux/commits/Takashi-Iwai/iov_iter-Fix-out-of-bound-access-in-iov_iter_advance/20160331-185222 config: ia64-allnoconfig (attached as .config) reproduce: wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree make.cross ARCH=ia64 All warnings (new ones prefixed by >>): lib/iov_iter.c: In function 'iov_iter_advance': >> lib/iov_iter.c:514:3: warning: 'return' with a value, in function returning >> void return 0; ^ vim +/return +514 lib/iov_iter.c 498 __copy_from_user_inatomic((p += v.iov_len) - v.iov_len, 499 v.iov_base, v.iov_len), 500 memcpy_from_page((p += v.bv_len) - v.bv_len, v.bv_page, 501 v.bv_offset, v.bv_len), 502 memcpy((p += v.iov_len) - v.iov_len, v.iov_base, v.iov_len) 503 ) 504 kunmap_atomic(kaddr); 505 return bytes; 506 } 507 EXPORT_SYMBOL(iov_iter_copy_from_user_atomic); 508 509 void iov_iter_advance(struct iov_iter *i, size_t size) 510 { 511 if (unlikely(size > i->count)) 512 size = i->count; 513 if (unlikely(!size)) > 514 return 0; 515 iterate_and_advance(i, size, v, 0, 0, 0) 516 } 517 EXPORT_SYMBOL(iov_iter_advance); 518 519 /* 520 * Return the count of just the current iov_iter segment. 521 */ 522 size_t iov_iter_single_seg_count(const struct iov_iter *i) --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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