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maple_tree: fix mas_prev() and mas_find() state handling 

When mas_prev() does not find anything, set the state to MAS_NONE.

Handle the MAS_NONE in mas_find() like a MAS_START.

Link: https://lkml.kernel.org/r/20230120162650.984577-7-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Reported-by: <syzbot+502859d610c661e56545@syzkaller.appspotmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Liam R. Howlett 2023-01-20 11:26:07 -05:00 committed by Andrew Morton
parent 1202700c3f
commit 17dc622c7b
1 changed files with 5 additions and 1 deletions
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6
lib/maple_tree.c
View File

@ -4845,7 +4845,7 @@ static inline void *mas_prev_entry(struct ma_state *mas, unsigned long min)
if (mas->index < min) {
mas->index = mas->last = min;
mas_pause(mas);
mas->node = MAS_NONE;
return NULL;
}
retry:
@ -5919,6 +5919,7 @@ void *mas_prev(struct ma_state *mas, unsigned long min)
if (!mas->index) {
/* Nothing comes before 0 */
mas->last = 0;
mas->node = MAS_NONE;
return NULL;
}
@ -6009,6 +6010,9 @@ void *mas_find(struct ma_state *mas, unsigned long max)
mas->index = ++mas->last;
}
if (unlikely(mas_is_none(mas)))
mas->node = MAS_START;
if (unlikely(mas_is_start(mas))) {
/* First run or continue */
void *entry;