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cpukit/libio: Fix race condition in iop free

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Closes #5411
This commit is contained in:
Aaron Nyholm
2026-02-06 15:57:33 +11:00
committed by Kinsey Moore
parent 7a4c7d1ed0
commit 9ff62c34f7
1 changed files with 9 additions and 5 deletions
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14
cpukit/libcsupport/src/libio.c
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@@ -154,10 +154,15 @@ rtems_libio_t *rtems_libio_allocate( void )
void rtems_libio_free_iop( rtems_libio_t *iop )
{
size_t zero;
unsigned int flags;
rtems_libio_lock();
if ( !rtems_libio_iop_is_free( iop ) ) {
/*
* Use atomic test and set so the contents of the if statement
* can only be run once. Therefore only added to the free list once.
*/
flags = rtems_libio_iop_flags_set( iop, LIBIO_FLAGS_FREE );
if ( ( flags & LIBIO_FLAGS_FREE ) == 0 ) {
rtems_libio_lock();
/*
* Clear the flags. All references should have been dropped.
*/
@@ -174,9 +179,8 @@ void rtems_libio_free_iop( rtems_libio_t *iop )
*/
*rtems_libio_iop_free_tail = iop;
rtems_libio_iop_free_tail = &iop->data1;
rtems_libio_unlock();
}
rtems_libio_unlock();
}
int rtems_libio_count_open_iops( void )