Fix a call to null pointer: in some cases, the unmonitor_fd can be called
from another fd's callback. That could lead to still have callback pending after unmonitoring the fd resulting in a call to null pointer. This is fixed by making unmonitor_fd now clear the pending fd_set too. Bug was introduced by my commit in 2008-12-23.
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parent
c33a588610
commit
a8d702d9b1
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@ -1,4 +1,4 @@
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/* $NetBSD: session.c,v 1.25 2009/04/21 18:38:32 tteras Exp $ */
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/* $NetBSD: session.c,v 1.26 2009/06/24 11:28:48 tteras Exp $ */
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/* $KAME: session.c,v 1.32 2003/09/24 02:01:17 jinmei Exp $ */
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@ -113,7 +113,7 @@ static void check_sigreq __P((void));
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static void check_flushsa __P((void));
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static int close_sockets __P((void));
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static fd_set mask;
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static fd_set preset_mask, active_mask;
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static struct fd_monitor fd_monitors[FD_SETSIZE];
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static int nfds = 0;
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@ -128,7 +128,7 @@ monitor_fd(int fd, int (*callback)(void *, int), void *ctx)
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exit(1);
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}
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FD_SET(fd, &mask);
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FD_SET(fd, &preset_mask);
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if (fd > nfds)
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nfds = fd;
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@ -144,7 +144,8 @@ unmonitor_fd(int fd)
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exit(1);
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}
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FD_CLR(fd, &mask);
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FD_CLR(fd, &preset_mask);
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FD_CLR(fd, &active_mask);
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fd_monitors[fd].callback = NULL;
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fd_monitors[fd].ctx = NULL;
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}
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@ -152,7 +153,6 @@ unmonitor_fd(int fd)
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int
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session(void)
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{
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fd_set rfds;
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struct timeval *timeout;
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int error;
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char pid_file[MAXPATHLEN];
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@ -161,7 +161,7 @@ session(void)
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int i;
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nfds = 0;
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FD_ZERO(&mask);
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FD_ZERO(&preset_mask);
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/* initialize schedular */
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sched_init();
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@ -274,9 +274,9 @@ session(void)
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/* schedular can change select() mask, so we reset
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* the working copy here */
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rfds = mask;
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active_mask = preset_mask;
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error = select(nfds + 1, &rfds, NULL, NULL, timeout);
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error = select(nfds + 1, &active_mask, NULL, NULL, timeout);
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if (error < 0) {
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switch (errno) {
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case EINTR:
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@ -291,8 +291,14 @@ session(void)
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}
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for (i = 0; i <= nfds; i++) {
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if (FD_ISSET(i, &rfds))
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if (!FD_ISSET(i, &active_mask))
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continue;
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if (fd_monitors[i].callback != NULL)
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fd_monitors[i].callback(fd_monitors[i].ctx, i);
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else
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plog(LLV_ERROR, LOCATION, NULL,
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"fd %d set, but no active callback\n", i);
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}
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}
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}
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