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Code Issues Releases Activity

Renew semaphore's pointer after wakeup since during msleep

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sem_base may have been modified by destroying one of semaphores
and semptr would not be valid in this case.

PR: kern/123731
This commit is contained in:
Oleksandr Tymoshenko 2008-06-19 18:08:42 +00:00
parent 145d2d3ac4
commit 23c8064e66
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=179879
1 changed files with 7 additions and 0 deletions
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7
sys/kern/sysv_sem.c
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@ -1166,6 +1166,13 @@ semop(td, uap)
goto done2;
}
/*
* Renew the semaphore's pointer after wakeup since
* during msleep sem_base may have been modified and semptr
* is not valid any more
*/
semptr = &semakptr->u.sem_base[sopptr->sem_num];
/*
* The semaphore is still alive. Readjust the count of
* waiting processes.