orangefs: keep the readdir entry size 64-bit in fill_from_part()

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commit 18227a6bc9 upstream.

fill_from_part() computes the size of a directory entry in size_t but
stores it in a __u32. An entry length near U32_MAX wraps it to a small
value, bypasses the bounds check, and is then used to index the entry,
reading far past the directory part -- an out-of-bounds read that oopses
the kernel.

Compute the size as a u64 so it cannot truncate; the bounds check then
rejects the entry. The trailer is supplied by the userspace client.

Fixes: 480e3e532e ("orangefs: support very large directories")
Cc: stable@vger.kernel.org
Signed-off-by: Bryam Vargas <hexlabsecurity@proton.me>
Link: https://patch.msgid.link/20260619-b4-disp-50d2bd59-v1-1-ce332969b4a2@proton.me
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Bryam Vargas 2026-06-19 04:38:20 -05:00 • committed by Greg Kroah-Hartman

parent e894b054be

commit a72bbb4368

1 changed files with 4 additions and 3 deletions

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fs/orangefs/dir.c

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