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zos: add checks to ensure behavior of epoll_wait

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PR-URL: https://github.com/libuv/libuv/pull/2013
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Signed-off-by: Irek Fakhrutdinov <ifakhrutdinov@rocketsoftware.com>
This commit is contained in:
Irek Fakhrutdinov 2020-03-15 11:12:42 +01:00 committed by Ben Noordhuis
parent 7d988e0763
commit 506e4bee7b
1 changed files with 23 additions and 1 deletions
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24
src/unix/os390-syscalls.c
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@ -278,6 +278,8 @@ int epoll_ctl(uv__os390_epoll* lst,
return 0;
}
#define EP_MAX_PFDS (ULONG_MAX / sizeof(struct pollfd))
#define EP_MAX_EVENTS (INT_MAX / sizeof(struct epoll_event))
int epoll_wait(uv__os390_epoll* lst, struct epoll_event* events,
int maxevents, int timeout) {
@ -289,12 +291,32 @@ int epoll_wait(uv__os390_epoll* lst, struct epoll_event* events,
struct pollfd msg_fd;
int i;
_SET_FDS_MSGS(size, 1, lst->size - 1);
if (!lst || !lst->items || !events) {
errno = EFAULT;
return -1;
}
if (lst->size > EP_MAX_PFDS) {
errno = EINVAL;
return -1;
}
if (maxevents <= 0 || maxevents > EP_MAX_EVENTS) {
errno = EINVAL;
return -1;
}
if (lst->size > 0)
_SET_FDS_MSGS(size, 1, lst->size - 1);
else
_SET_FDS_MSGS(size, 0, 0);
pfds = lst->items;
pollret = poll(pfds, size, timeout);
if (pollret <= 0)
return pollret;
assert(lst->size > 0);
pollret = _NFDS(pollret) + _NMSGS(pollret);
reventcount = 0;