In the Linux kernel, the following vulnerability has been resolved:

ocfs2: fix NULL h_transaction deref in ocfs2_assure_trans_credits

[BUG]
A direct write over unwritten extents can panic the kernel in
ocfs2_assure_trans_credits() when the journal aborts during DIO
completion. The crash is a general protection fault from a NULL pointer
dereference.

[CAUSE]
ocfs2_dio_end_io_write() loops over a direct write's unwritten extents,
marking each written under a single journal handle. If the journal
aborts (for example after an I/O error) while the extent tree is being
updated, the handle is left aborted with its transaction pointer
cleared. The extent merge treats that failure as not critical and
reports success, so the loop keeps using the handle.
ocfs2_assure_trans_credits() reads the handle's remaining credits
without first checking whether the handle is aborted, and that read
dereferences the cleared transaction pointer.

[FIX]
A journal abort is recorded in the handle itself, so callers are
expected to test the handle rather than rely on a returned error.
Make ocfs2_assure_trans_credits() do that, as the other ocfs2 journal
helpers already do, and return -EROFS when the handle is aborted.

https://git.kernel.org/stable/c/253ed993e0b36997ec7b04c1ff76103b38241de2

https://git.kernel.org/stable/c/2d80e9c56718435a9c9f5f24dbc954989aead579

https://git.kernel.org/stable/c/6ad7532a23bc94076efe9f1486dd7f7493c090ff

https://git.kernel.org/stable/c/7146d191dae3a8efdb957993fb61a55713186266

https://git.kernel.org/stable/c/942b818b396c24c452681803ff291552317d2ef1

https://git.kernel.org/stable/c/bd73971fad89d5ee4ea0ba9b92d2ea08733c4a64

https://git.kernel.org/stable/c/f14aaaa130356ee4adb44de947c098637c70df8f

https://git.kernel.org/stable/c/f9ab30c96b0f00c20c6dac93681bdae3a033d229

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