maple_tree: fix mas_empty_area_rev() null pointer dereference
commit 955a923d2809803980ff574270f81510112be9cf upstream.
Currently the code calls mas_start() followed by mas_data_end() if the
maple state is MA_START, but mas_start() may return with the maple state
node == NULL. This will lead to a null pointer dereference when checking
information in the NULL node, which is done in mas_data_end().
Avoid setting the offset if there is no node by waiting until after the
maple state is checked for an empty or single entry state.
A user could trigger the events to cause a kernel oops by unmapping all
vmas to produce an empty maple tree, then mapping a vma that would cause
the scenario described above.
Link: https://lkml.kernel.org/r/20240422203349.2418465-1-Liam.Howlett@oracle.com
Fixes: 54a611b60590 ("Maple Tree: add new data structure")
BUG=b/346513745
TEST=presubmit
RELEASE_NOTE=Fixes CVE-2024-36891 in the Linux kernel
cos-patch: security-moderate
Change-Id: Ic303187139c3cee97fbcc01528852b75fd9ae633
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Reported-by: Marius Fleischer <fleischermarius@gmail.com>
Closes: https://lore.kernel.org/lkml/CAJg=8jyuSxDL6XvqEXY_66M20psRK2J53oBTP+fjV5xpW2-R6w@mail.gmail.com/
Link: https://lore.kernel.org/lkml/CAJg=8jyuSxDL6XvqEXY_66M20psRK2J53oBTP+fjV5xpW2-R6w@mail.gmail.com/
Tested-by: Marius Fleischer <fleischermarius@gmail.com>
Tested-by: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-on: https://cos-review.googlesource.com/c/third_party/kernel/+/76399
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Reviewed-by: Oleksandr Tymoshenko <ovt@google.com>
diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index 06a9781..9a5bdf1 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -5368,18 +5368,18 @@ int mas_empty_area_rev(struct ma_state *mas, unsigned long min,
if (min >= max)
return -EINVAL;
- if (mas_is_start(mas)) {
+ if (mas_is_start(mas))
mas_start(mas);
- mas->offset = mas_data_end(mas);
- } else if (mas->offset >= 2) {
- mas->offset -= 2;
- } else if (!mas_rewind_node(mas)) {
+ else if ((mas->offset < 2) && (!mas_rewind_node(mas)))
return -EBUSY;
- }
- /* Empty set. */
- if (mas_is_none(mas) || mas_is_ptr(mas))
+ if (unlikely(mas_is_none(mas) || mas_is_ptr(mas)))
return mas_sparse_area(mas, min, max, size, false);
+ else if (mas->offset >= 2)
+ mas->offset -= 2;
+ else
+ mas->offset = mas_data_end(mas);
+
/* The start of the window can only be within these values. */
mas->index = min;
