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xen/grant-table: never put a reserved grant on the free list

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Make sure a reserved grant is never put on the free list, as this could
cause hard to debug errors.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Juergen Gross 2022-05-05 08:35:31 +02:00
parent 79c22318f8
commit 8c9eb0e373
1 changed files with 4 additions and 0 deletions
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4
drivers/xen/grant-table.c
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@ -207,6 +207,10 @@ static inline void check_free_callbacks(void)
static void put_free_entry(grant_ref_t ref)
{
unsigned long flags;
if (unlikely(ref < GNTTAB_NR_RESERVED_ENTRIES))
return;
spin_lock_irqsave(&gnttab_list_lock, flags);
gnttab_entry(ref) = gnttab_free_head;
gnttab_free_head = ref;