Hi 'Guanjun', https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Guanjun/Drivers-for-Alibaba-YCC-Yitian-Cryptography-Complex-cryptographic-accelerator/20221103-154448 base: https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git master patch link: https://lore.kernel.org/r/1667461243-48652-9-git-send-email-guanjun%40linux.alibaba.com patch subject: [PATCH v3 RESEND 8/9] crypto/ycc: Add sm2 algorithm support config: ia64-randconfig-m031-20221104 compiler: ia64-linux-gcc (GCC) 12.1.0 If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Reported-by: Dan Carpenter <error27@xxxxxxxxx> smatch warnings: drivers/crypto/ycc/ycc_pke.c:880 ycc_sm2_exit() warn: variable dereferenced before check 'ctx->ring' (see line 878) vim +880 drivers/crypto/ycc/ycc_pke.c eb2973011f26b6 Xuchun Shang 2022-11-03 875 static void ycc_sm2_exit(struct crypto_akcipher *tfm) eb2973011f26b6 Xuchun Shang 2022-11-03 876 { eb2973011f26b6 Xuchun Shang 2022-11-03 877 struct ycc_pke_ctx *ctx = akcipher_tfm_ctx(tfm); eb2973011f26b6 Xuchun Shang 2022-11-03 @878 struct device *dev = YCC_DEV(ctx); ctx->ring dereferenced inside YCC_DEV() (says the checker). eb2973011f26b6 Xuchun Shang 2022-11-03 879 eb2973011f26b6 Xuchun Shang 2022-11-03 @880 if (ctx->ring) ^^^^^^^^^ Checked too late. eb2973011f26b6 Xuchun Shang 2022-11-03 881 ycc_crypto_free_ring(ctx->ring); eb2973011f26b6 Xuchun Shang 2022-11-03 882 eb2973011f26b6 Xuchun Shang 2022-11-03 883 if (ctx->pub_key_vaddr) eb2973011f26b6 Xuchun Shang 2022-11-03 884 dma_free_coherent(dev, 64, ctx->pub_key_vaddr, ctx->pub_key_paddr); eb2973011f26b6 Xuchun Shang 2022-11-03 885 eb2973011f26b6 Xuchun Shang 2022-11-03 886 crypto_free_akcipher(ctx->soft_tfm); eb2973011f26b6 Xuchun Shang 2022-11-03 887 } -- 0-DAY CI Kernel Test Service https://01.org/lkp
