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 nHSBe3NM 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https://lore.kernel.org/all/ZFunF7DmMdK05MoF@FVFF77S0Q05N.cambridge.arm.com/ > > The problem is in the current code base we didn't fixup "prev" for the case > where "start" address can be within the "prev" vma section. In that case > we should have "prev" points to the current vma rather than the previous > one when feeding to vma_merge(). > > This patch will eliminate the report and make sure vma_merge() calls will > become legal again. > > One thing to mention is that the "Fixes: 29417d292bd0" below is there only > to help explain where the warning can start to trigger, the real commit to > fix should be 69dbe6daf104. Commit 29417d292bd0 helps us to identify the > issue, but unfortunately we may want to keep it in Fixes too just to ease > kernel backporters for easier tracking. > > Cc: Lorenzo Stoakes > Cc: Mike Rapoport (IBM) > Cc: Liam R. Howlett > Reported-by: Mark Rutland > Fixes: 29417d292bd0 ("mm/mmap/vma_merge: always check invariants") > Fixes: 69dbe6daf104 ("userfaultfd: use maple tree iterator to iterate VMAs") > Closes: https://lore.kernel.org/all/ZFunF7DmMdK05MoF@FVFF77S0Q05N.cambridge.arm.com/ > Cc: linux-stable > Signed-off-by: Peter Xu Reviewed-by: Liam R. Howlett > --- > fs/userfaultfd.c | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c > index 0fd96d6e39ce..17c8c345dac4 100644 > --- a/fs/userfaultfd.c > +++ b/fs/userfaultfd.c > @@ -1459,6 +1459,8 @@ static int userfaultfd_register(struct userfaultfd_ctx *ctx, > > vma_iter_set(&vmi, start); > prev = vma_prev(&vmi); > + if (vma->vm_start < start) > + prev = vma; > > ret = 0; > for_each_vma_range(vmi, vma, end) { > @@ -1625,6 +1627,9 @@ static int userfaultfd_unregister(struct userfaultfd_ctx *ctx, > > vma_iter_set(&vmi, start); > prev = vma_prev(&vmi); > + if (vma->vm_start < start) > + prev = vma; > + > ret = 0; > for_each_vma_range(vmi, vma, end) { > cond_resched(); > -- > 2.39.1 >