fs/ntfs3: add depth limit to indx_find_buffer to prevent stack overflow

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indx_find_buffer() recursively descends the B+ tree index with no depth
limit.  A crafted NTFS image with circular index node references causes
unbounded recursion, overflowing the kernel stack and panicking the
system.

This is reachable by mounting a malicious NTFS filesystem (e.g. from a
USB drive via desktop automount) and deleting a file whose index entry
triggers the rebalancing fallback path in indx_delete_entry().

Add a depth parameter and bail out with -EINVAL when it reaches the
fnd->nodes array bound, matching the constraint already enforced by
fnd_push() in indx_find().

The related function indx_find() was previously patched for a similar
infinite-loop issue (commit 1732053c8a), but indx_find_buffer() was
missed.

Fixes: 82cae269cf ("fs/ntfs3: Add initialization of super block")
Cc: stable@vger.kernel.org
Assisted-by: Claude:claude-opus-4-6
Assisted-by: Codex:gpt-5-4
Signed-off-by: Michael Bommarito <michael.bommarito@gmail.com>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>

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Michael Bommarito 2026-04-13 09:31:17 -04:00 • committed by Konstantin Komarov

parent 254f49634e

commit 1ebd684b8f

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1 changed files with 12 additions and 3 deletions

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fs/ntfs3/index.c

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