From c316efc3cf90fba1b673373669096ad6a3e39cc4 Mon Sep 17 00:00:00 2001 From: Feifei Wang Date: Fri, 21 May 2021 10:00:04 +0800 Subject: [PATCH] crypto/qat: fix Arm build with special memcpy MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit In Arm platform, when "RTE_ARCH_ARM64_MEMCPY" is set as true, gcc will report variable uninitialized warning: ../drivers/crypto/qat/qat_sym_session.c: In function ‘partial_hash_compute’: ../lib/eal/include/generic/rte_byteorder.h:241:24: warning: ‘’ may be used uninitialized in this function [-Wmaybe-uninitialized] 241 | #define rte_bswap32(x) __builtin_bswap32(x) ... This is because "digest" will be initialized by "rte_memcpy" function rather than "memcpy" if "RTE_ARCH_ARM64_MEMCPY" is set as true. Furthermore, 'rte_memcpy' will initialize 'digest' with two steps by invoking rte_mov_x functions. For example: partial_hash_sha1 -> rte_memcpy -> rte_memcpy_ge16_lt_128 -> step 1: rte_mov16(dst,src ) step 2: rte_mov16(dst - 16 + n, src - 16 + n) However, gcc compiler cannot identify this multi-step initialization, then it will report warning. To fix this, use "memset" to initialize "digest". Fixes: cd7fc8a84b48 ("eal/arm64: optimize memcpy") Cc: stable@dpdk.org Signed-off-by: Feifei Wang Reviewed-by: Ruifeng Wang Reviewed-by: Honnappa Nagarahalli Acked-by: Adam Dybkowski --- drivers/crypto/qat/qat_sym_session.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/crypto/qat/qat_sym_session.c b/drivers/crypto/qat/qat_sym_session.c index 231b1640da..e22dd3600c 100644 --- a/drivers/crypto/qat/qat_sym_session.c +++ b/drivers/crypto/qat/qat_sym_session.c @@ -1196,6 +1196,9 @@ static int partial_hash_compute(enum icp_qat_hw_auth_algo hash_alg, uint64_t *hash_state_out_be64; int i; + /* Initialize to avoid gcc warning */ + memset(digest, 0, sizeof(digest)); + digest_size = qat_hash_get_digest_size(hash_alg); if (digest_size <= 0) return -EFAULT; -- 2.20.1