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Fixed bug #51379: (Sockets: prevent select_waiting overflow)

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This commit is contained in:
goldsimon 2017-07-14 20:16:11 +02:00
parent aa317dcb18
commit 3c371e4d52
1 changed files with 12 additions and 2 deletions
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14
src/api/sockets.c
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@ -1912,13 +1912,23 @@ lwip_select(int maxfdp1, fd_set *readset, fd_set *writeset, fd_set *exceptset,
sock = tryget_socket_unconn(i);
if (sock != NULL) {
sock->select_waiting++;
LWIP_ASSERT("sock->select_waiting > 0", sock->select_waiting > 0);
if (sock->select_waiting == 0) {
/* overflow - too many threads waiting */
sock->select_waiting--;
done_socket(sock);
nready = -1;
maxfdp2 = i;
SYS_ARCH_UNPROTECT(lev);
set_errno(EBUSY);
break;
}
done_socket(sock);
} else {
/* Not a valid socket */
nready = -1;
maxfdp2 = i;
SYS_ARCH_UNPROTECT(lev);
set_errno(EBADF);
break;
}
SYS_ARCH_UNPROTECT(lev);
@ -1969,6 +1979,7 @@ lwip_select(int maxfdp1, fd_set *readset, fd_set *writeset, fd_set *exceptset,
} else {
/* Not a valid socket */
nready = -1;
set_errno(EBADF);
}
SYS_ARCH_UNPROTECT(lev);
}
@ -2002,7 +2013,6 @@ lwip_select(int maxfdp1, fd_set *readset, fd_set *writeset, fd_set *exceptset,
if (nready < 0) {
/* This happens when a socket got closed while waiting */
set_errno(EBADF);
lwip_select_dec_sockets_used(maxfdp1, &used_sockets);
return -1;
}