diff options
| -rw-r--r-- | linux-user/syscall.c | 20 |
1 files changed, 13 insertions, 7 deletions
diff --git a/linux-user/syscall.c b/linux-user/syscall.c index 8fa8e0ce14..c2169664d5 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -8046,14 +8046,20 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1, struct pollfd *pfd; unsigned int i; - target_pfd = lock_user(VERIFY_WRITE, arg1, sizeof(struct target_pollfd) * nfds, 1); - if (!target_pfd) - goto efault; + pfd = NULL; + target_pfd = NULL; + if (nfds) { + target_pfd = lock_user(VERIFY_WRITE, arg1, + sizeof(struct target_pollfd) * nfds, 1); + if (!target_pfd) { + goto efault; + } - pfd = alloca(sizeof(struct pollfd) * nfds); - for(i = 0; i < nfds; i++) { - pfd[i].fd = tswap32(target_pfd[i].fd); - pfd[i].events = tswap16(target_pfd[i].events); + pfd = alloca(sizeof(struct pollfd) * nfds); + for (i = 0; i < nfds; i++) { + pfd[i].fd = tswap32(target_pfd[i].fd); + pfd[i].events = tswap16(target_pfd[i].events); + } } # ifdef TARGET_NR_ppoll |