This setsockopt accepts zero-lengh optlen (current qemu implementation does not allow this). Also, there's no need to make a copy of the key, it is enough to use lock_user() (which accepts zero length already).
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2197 Fixes: f31dddd2fc "linux-user: Add support for setsockopt() option SOL_ALG" Signed-off-by: Michael Tokarev <m...@tls.msk.ru> Message-Id: <20240331100737.2724186-2-...@tls.msk.ru> Signed-off-by: Richard Henderson <richard.hender...@linaro.org> (cherry picked from commit 04f6fb897a5aeb3e356a7b889869c9962f9c16c7) Signed-off-by: Michael Tokarev <m...@tls.msk.ru> diff --git a/linux-user/syscall.c b/linux-user/syscall.c index 3df2b94d9a..59fb3e911f 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -2277,18 +2277,13 @@ static abi_long do_setsockopt(int sockfd, int level, int optname, switch (optname) { case ALG_SET_KEY: { - char *alg_key = g_malloc(optlen); - + char *alg_key = lock_user(VERIFY_READ, optval_addr, optlen, 1); if (!alg_key) { - return -TARGET_ENOMEM; - } - if (copy_from_user(alg_key, optval_addr, optlen)) { - g_free(alg_key); return -TARGET_EFAULT; } ret = get_errno(setsockopt(sockfd, level, optname, alg_key, optlen)); - g_free(alg_key); + unlock_user(alg_key, optval_addr, optlen); break; } case ALG_SET_AEAD_AUTHSIZE: -- 2.39.2
