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ANDROID: userfaultfd: Fix untag pointer in userfaultfd_continue()

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Fixes e71e2ace5721 ("userfaultfd: do not untag user pointers").

Above patch is ported from upstream into LTS branch then merged into
android12-5.4. The original patch was going to fix all untag user
pointers.

The change to userfaultfd_continue() was cut off when being merged into
LTS because the routine does not exist in LTS.

But specially the routine has been cherry-picked into android12-5.4 with
commit b69f713e60d0 ("BACKPORT: FROMGIT: userfaultfd: add
UFFDIO_CONTINUE ioctl") by Lokesh Gidra <[email protected]> long
ago.

So add back the missing part of fixing here.

Fixes: e71e2ace5721 ("userfaultfd: do not untag user pointers")
Change-Id: I32da80c2e9517356daadf566a433e056f6bef08c
Signed-off-by: Orson Zhai <[email protected]>
This commit is contained in:
Orson Zhai 2021-11-08 18:11:47 +08:00 • committed by Michael Bestas
commit 91e49e5534
1 changed files with 1 additions and 1 deletions
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2
fs/userfaultfd.c
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@ -1862,7 +1862,7 @@ static int userfaultfd_continue(struct userfaultfd_ctx *ctx, unsigned long arg)
sizeof(uffdio_continue) - (sizeof(__s64))))
goto out;
ret = validate_range(ctx->mm, &uffdio_continue.range.start,
ret = validate_range(ctx->mm, uffdio_continue.range.start,
uffdio_continue.range.len);
if (ret)
goto out;