[PATCH] epoll: handle timeout overflow
Handle the timeout upper boundary for epoll. Signed-off-by: Davide Libenzi <davidel@xmailserver.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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1 changed files with 6 additions and 2 deletions
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@ -101,6 +101,10 @@
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/* Maximum number of poll wake up nests we are allowing */
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/* Maximum number of poll wake up nests we are allowing */
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#define EP_MAX_POLLWAKE_NESTS 4
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#define EP_MAX_POLLWAKE_NESTS 4
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/* Maximum msec timeout value storeable in a long int */
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#define EP_MAX_MSTIMEO min(1000ULL * MAX_SCHEDULE_TIMEOUT / HZ, (LONG_MAX - 999ULL) / HZ)
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struct epoll_filefd {
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struct epoll_filefd {
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struct file *file;
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struct file *file;
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int fd;
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int fd;
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@ -1506,8 +1510,8 @@ static int ep_poll(struct eventpoll *ep, struct epoll_event __user *events,
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* and the overflow condition. The passed timeout is in milliseconds,
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* and the overflow condition. The passed timeout is in milliseconds,
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* that why (t * HZ) / 1000.
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* that why (t * HZ) / 1000.
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*/
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*/
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jtimeout = timeout == -1 || timeout > (MAX_SCHEDULE_TIMEOUT - 1000) / HZ ?
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jtimeout = (timeout < 0 || timeout >= EP_MAX_MSTIMEO) ?
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MAX_SCHEDULE_TIMEOUT: (timeout * HZ + 999) / 1000;
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MAX_SCHEDULE_TIMEOUT : (timeout * HZ + 999) / 1000;
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retry:
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retry:
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write_lock_irqsave(&ep->lock, flags);
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write_lock_irqsave(&ep->lock, flags);
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