[PATCH mm-unstable 0/2] mm/mmap: fix crashes in dup_mmap() error path

[Hui Zhu <hui.zhu@linux.dev>]

From: Hui Zhu <zhuhui@kylinos.cn>

This series fixes two potential kernel panics in the dup_mmap() error
path triggered during fork failures:
Fix Use-After-Free: Moves vma_iter_free() to the end of the cleanup
block to ensure the iterator remains valid during rollback.
Fix NULL Dereference: Adds a check for vma_next() results to prevent
crashing when the maple tree is empty.

Hui Zhu (2):
  mm/mmap: fix Use-After-Free of vma_iterator in dup_mmap() error path
  mm/mmap: fix NULL pointer dereference in dup_mmap() error handling

 mm/mmap.c | 34 ++++++++++++++++++++--------------
 1 file changed, 20 insertions(+), 14 deletions(-)

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2.43.0