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Howlett [241031 13:01]: > From: "Liam R. Howlett" > > There have been no reported infinite loops in the tree, but checking the > detection of an infinite loop during validation is simple enough. Add > the detection to the validate_mm() function so that error reports are > clear and don't just report stalls. > > This does not protect against internal maple tree issues, but it does > detect too many vmas being returned from the tree. I should add: This patch does have the downside of making the count difference less useful (we will only see one extra as apposed to what may exist). > > Signed-off-by: Liam R. Howlett > Cc: Lorenzo Stoakes > Cc: Vlastimil Babka > Cc: Jann Horn > --- > mm/vma.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/mm/vma.c b/mm/vma.c > index 68138e8c153e..60ed8cc187ad 100644 > --- a/mm/vma.c > +++ b/mm/vma.c > @@ -615,7 +615,8 @@ void validate_mm(struct mm_struct *mm) > anon_vma_unlock_read(anon_vma); > } > #endif > - i++; > + if (++i > mm->map_count) > + break; > } > if (i != mm->map_count) { > pr_emerg("map_count %d vma iterator %d\n", mm->map_count, i); > -- > 2.43.0 >