[kbuild-all] [meghadey-crypto:crypto-avx512 5/6] arch/x86/crypto/aesni-intel_glue.c:725 gcmaes_crypt_by_sg() warn: possible memory leak of 'data'

tree: https://github.com/meghadey/crypto crypto-avx512 head: 9c8c2ca77f6e2575a130bddb9767d068e1162d71 commit: 377aede9f10ee28be954473668bc6d33c6c9db75 [5/6] crypto: aesni - AVX512 version of AESNI-GCM using VPCLMULQDQ config: x86_64-randconfig-m001-20210930 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; Reported-by: Dan Carpenter <dan.carpenter(a)oracle.com&gt; smatch warnings: arch/x86/crypto/aesni-intel_glue.c:725 gcmaes_crypt_by_sg() warn: possible memory leak of 'data' vim +/data +725 arch/x86/crypto/aesni-intel_glue.c e845520707f85c Dave Watson 2018-02-14 677 static int gcmaes_crypt_by_sg(bool enc, struct aead_request *req, e845520707f85c Dave Watson 2018-02-14 678 unsigned int assoclen, u8 *hash_subkey, 83c83e658863e4 Ard Biesheuvel 2021-01-04 679 u8 *iv, void *aes_ctx, u8 *auth_tag, 83c83e658863e4 Ard Biesheuvel 2021-01-04 680 unsigned long auth_tag_len) e845520707f85c Dave Watson 2018-02-14 681 { a13ed1d15b07a0 Ard Biesheuvel 2021-01-04 682 u8 databuf[sizeof(struct gcm_context_data) + (AESNI_ALIGN - 8)] __aligned(8); a13ed1d15b07a0 Ard Biesheuvel 2021-01-04 683 struct gcm_context_data *data = PTR_ALIGN((void *)databuf, AESNI_ALIGN); e845520707f85c Dave Watson 2018-02-14 684 unsigned long left = req->cryptlen; e845520707f85c Dave Watson 2018-02-14 685 struct scatter_walk assoc_sg_walk; 83c83e658863e4 Ard Biesheuvel 2021-01-04 686 struct skcipher_walk walk; d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 687 bool do_avx, do_avx2; e845520707f85c Dave Watson 2018-02-14 688 u8 *assocmem = NULL; 83c83e658863e4 Ard Biesheuvel 2021-01-04 689 u8 *assoc; 83c83e658863e4 Ard Biesheuvel 2021-01-04 690 int err; 377aede9f10ee2 Megha Dey 2021-01-20 691 int hash_key_size; 377aede9f10ee2 Megha Dey 2021-01-20 692 377aede9f10ee2 Megha Dey 2021-01-20 693 if (static_branch_likely(&gcm_use_avx512)) 377aede9f10ee2 Megha Dey 2021-01-20 694 hash_key_size = 16 * GCM_AVX512_NUM_HASH_KEYS; 377aede9f10ee2 Megha Dey 2021-01-20 695 else 377aede9f10ee2 Megha Dey 2021-01-20 696 hash_key_size = 16 * GCM_BLOCK_LEN; 377aede9f10ee2 Megha Dey 2021-01-20 697 377aede9f10ee2 Megha Dey 2021-01-20 698 /* Allocate gcm_context_data structure on the heap. With the 377aede9f10ee2 Megha Dey 2021-01-20 699 * VPCLMULQDQ version of GCM needing 48 hashkeys, allocating 377aede9f10ee2 Megha Dey 2021-01-20 700 * this structure on the stack will inflate its size significantly. 377aede9f10ee2 Megha Dey 2021-01-20 701 */ 377aede9f10ee2 Megha Dey 2021-01-20 702 data = kzalloc(sizeof(*data) + hash_key_size, GFP_KERNEL); 377aede9f10ee2 Megha Dey 2021-01-20 703 if (!data) { 377aede9f10ee2 Megha Dey 2021-01-20 704 kfree(data); No need for this kfree. 377aede9f10ee2 Megha Dey 2021-01-20 705 return -ENOMEM; 377aede9f10ee2 Megha Dey 2021-01-20 706 } e845520707f85c Dave Watson 2018-02-14 707 e845520707f85c Dave Watson 2018-02-14 708 if (!enc) e845520707f85c Dave Watson 2018-02-14 709 left -= auth_tag_len; e845520707f85c Dave Watson 2018-02-14 710 d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 711 do_avx = (left >= AVX_GEN2_OPTSIZE); d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 712 do_avx2 = (left >= AVX_GEN4_OPTSIZE); 603f8c3b0dbbe2 Dave Watson 2018-12-10 713 e845520707f85c Dave Watson 2018-02-14 714 /* Linearize assoc, if not already linear */ 2694e23ffd210c Ard Biesheuvel 2021-01-04 715 if (req->src->length >= assoclen && req->src->length) { e845520707f85c Dave Watson 2018-02-14 716 scatterwalk_start(&assoc_sg_walk, req->src); e845520707f85c Dave Watson 2018-02-14 717 assoc = scatterwalk_map(&assoc_sg_walk); e845520707f85c Dave Watson 2018-02-14 718 } else { 2694e23ffd210c Ard Biesheuvel 2021-01-04 719 gfp_t flags = (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ? 2694e23ffd210c Ard Biesheuvel 2021-01-04 720 GFP_KERNEL : GFP_ATOMIC; 2694e23ffd210c Ard Biesheuvel 2021-01-04 721 e845520707f85c Dave Watson 2018-02-14 722 /* assoc can be any length, so must be on heap */ 2694e23ffd210c Ard Biesheuvel 2021-01-04 723 assocmem = kmalloc(assoclen, flags); e845520707f85c Dave Watson 2018-02-14 724 if (unlikely(!assocmem)) e845520707f85c Dave Watson 2018-02-14 @725 return -ENOMEM; "data" leaked on this path and the next. e845520707f85c Dave Watson 2018-02-14 726 assoc = assocmem; e845520707f85c Dave Watson 2018-02-14 727 e845520707f85c Dave Watson 2018-02-14 728 scatterwalk_map_and_copy(assoc, req->src, 0, assoclen, 0); e845520707f85c Dave Watson 2018-02-14 729 } e845520707f85c Dave Watson 2018-02-14 730 e845520707f85c Dave Watson 2018-02-14 731 kernel_fpu_begin(); 377aede9f10ee2 Megha Dey 2021-01-20 732 377aede9f10ee2 Megha Dey 2021-01-20 733 if (static_branch_likely(&gcm_use_avx512) && 377aede9f10ee2 Megha Dey 2021-01-20 734 IS_ENABLED(CONFIG_CRYPTO_AES_GCM_AVX512)) 377aede9f10ee2 Megha Dey 2021-01-20 735 aesni_gcm_init_avx_512(aes_ctx, data, iv, hash_subkey, assoc, 377aede9f10ee2 Megha Dey 2021-01-20 736 assoclen); 377aede9f10ee2 Megha Dey 2021-01-20 737 else if (static_branch_likely(&gcm_use_avx2) && do_avx2) d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 738 aesni_gcm_init_avx_gen4(aes_ctx, data, iv, hash_subkey, assoc, d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 739 assoclen); d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 740 else if (static_branch_likely(&gcm_use_avx) && do_avx) d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 741 aesni_gcm_init_avx_gen2(aes_ctx, data, iv, hash_subkey, assoc, d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 742 assoclen); d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 743 else d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 744 aesni_gcm_init(aes_ctx, data, iv, hash_subkey, assoc, assoclen); e845520707f85c Dave Watson 2018-02-14 745 kernel_fpu_end(); e845520707f85c Dave Watson 2018-02-14 746 e845520707f85c Dave Watson 2018-02-14 747 if (!assocmem) e845520707f85c Dave Watson 2018-02-14 748 scatterwalk_unmap(assoc); e845520707f85c Dave Watson 2018-02-14 749 else e845520707f85c Dave Watson 2018-02-14 750 kfree(assocmem); e845520707f85c Dave Watson 2018-02-14 751 83c83e658863e4 Ard Biesheuvel 2021-01-04 752 err = enc ? skcipher_walk_aead_encrypt(&walk, req, false) 83c83e658863e4 Ard Biesheuvel 2021-01-04 753 : skcipher_walk_aead_decrypt(&walk, req, false); e845520707f85c Dave Watson 2018-02-14 754 83c83e658863e4 Ard Biesheuvel 2021-01-04 755 while (walk.nbytes > 0) { 83c83e658863e4 Ard Biesheuvel 2021-01-04 756 kernel_fpu_begin(); 377aede9f10ee2 Megha Dey 2021-01-20 757 if (static_branch_likely(&gcm_use_avx512) 377aede9f10ee2 Megha Dey 2021-01-20 758 && IS_ENABLED(CONFIG_CRYPTO_AES_GCM_AVX512)) { 377aede9f10ee2 Megha Dey 2021-01-20 759 if (enc) 377aede9f10ee2 Megha Dey 2021-01-20 760 aesni_gcm_enc_update_avx_512(aes_ctx, data, 377aede9f10ee2 Megha Dey 2021-01-20 761 walk.dst.virt.addr, 377aede9f10ee2 Megha Dey 2021-01-20 762 walk.src.virt.addr, 377aede9f10ee2 Megha Dey 2021-01-20 763 walk.nbytes); 377aede9f10ee2 Megha Dey 2021-01-20 764 else 377aede9f10ee2 Megha Dey 2021-01-20 765 aesni_gcm_dec_update_avx_512(aes_ctx, data, 377aede9f10ee2 Megha Dey 2021-01-20 766 walk.dst.virt.addr, 377aede9f10ee2 Megha Dey 2021-01-20 767 walk.src.virt.addr, 377aede9f10ee2 Megha Dey 2021-01-20 768 walk.nbytes); 377aede9f10ee2 Megha Dey 2021-01-20 769 } else if (static_branch_likely(&gcm_use_avx2) && do_avx2) { d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 770 if (enc) d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 771 aesni_gcm_enc_update_avx_gen4(aes_ctx, data, d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 772 walk.dst.virt.addr, d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 773 walk.src.virt.addr, d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 774 walk.nbytes); d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 775 else d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 776 aesni_gcm_dec_update_avx_gen4(aes_ctx, data, d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 777 walk.dst.virt.addr, d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 778 walk.src.virt.addr, d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 779 walk.nbytes); d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 780 } else if (static_branch_likely(&gcm_use_avx) && do_avx) { d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 781 if (enc) d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 782 aesni_gcm_enc_update_avx_gen2(aes_ctx, data, d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 783 walk.dst.virt.addr, d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 784 walk.src.virt.addr, d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 785 walk.nbytes); d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 786 else d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 787 aesni_gcm_dec_update_avx_gen2(aes_ctx, data, d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 788 walk.dst.virt.addr, d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 789 walk.src.virt.addr, d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 790 walk.nbytes); d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 791 } else if (enc) { d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 792 aesni_gcm_enc_update(aes_ctx, data, walk.dst.virt.addr, 83c83e658863e4 Ard Biesheuvel 2021-01-04 793 walk.src.virt.addr, walk.nbytes); d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 794 } else { d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 795 aesni_gcm_dec_update(aes_ctx, data, walk.dst.virt.addr, d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 796 walk.src.virt.addr, walk.nbytes); d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 797 } 83c83e658863e4 Ard Biesheuvel 2021-01-04 798 kernel_fpu_end(); e845520707f85c Dave Watson 2018-02-14 799 83c83e658863e4 Ard Biesheuvel 2021-01-04 800 err = skcipher_walk_done(&walk, 0); e845520707f85c Dave Watson 2018-02-14 801 } e845520707f85c Dave Watson 2018-02-14 802 83c83e658863e4 Ard Biesheuvel 2021-01-04 803 if (err) 83c83e658863e4 Ard Biesheuvel 2021-01-04 804 return err; Here too. 83c83e658863e4 Ard Biesheuvel 2021-01-04 805 83c83e658863e4 Ard Biesheuvel 2021-01-04 806 kernel_fpu_begin(); 377aede9f10ee2 Megha Dey 2021-01-20 807 if (static_branch_likely(&gcm_use_avx512) && 377aede9f10ee2 Megha Dey 2021-01-20 808 IS_ENABLED(CONFIG_CRYPTO_AES_GCM_AVX512)) 377aede9f10ee2 Megha Dey 2021-01-20 809 aesni_gcm_finalize_avx_512(aes_ctx, data, auth_tag, 377aede9f10ee2 Megha Dey 2021-01-20 810 auth_tag_len); 377aede9f10ee2 Megha Dey 2021-01-20 811 else if (static_branch_likely(&gcm_use_avx2) && do_avx2) d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 812 aesni_gcm_finalize_avx_gen4(aes_ctx, data, auth_tag, d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 813 auth_tag_len); d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 814 else if (static_branch_likely(&gcm_use_avx) && do_avx) d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 815 aesni_gcm_finalize_avx_gen2(aes_ctx, data, auth_tag, d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 816 auth_tag_len); d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 817 else d6cbf4eaa46794 Ard Biesheuvel 2021-01-04 818 aesni_gcm_finalize(aes_ctx, data, auth_tag, auth_tag_len); 83c83e658863e4 Ard Biesheuvel 2021-01-04 819 kernel_fpu_end(); e845520707f85c Dave Watson 2018-02-14 820 377aede9f10ee2 Megha Dey 2021-01-20 821 kfree(data); e845520707f85c Dave Watson 2018-02-14 822 return 0; e845520707f85c Dave Watson 2018-02-14 823 } --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org