In the Linux kernel, the following vulnerability has been resolved:
lockd: Plug nlm_file leak when nlm_do_fopen() fails
A client can repeatedly drive nlm_do_fopen() failures by presenting file handles that the underlying export rejects. After kzalloc_obj() succeeds in nlm_lookup_file(), the freshly allocated nlm_file is not yet inserted into nlm_files[]. The nlm_do_fopen() failure path jumps to out_unlock, which releases nlm_file_mutex and returns without freeing the allocation, so each failure leaks one nlm_file.
Route the failure through out_free so kfree() runs before the function returns.
References
- https://git.kernel.org/stable/c/1161c4b5bd0048c8148e919f818a33cff3623ef0
- https://git.kernel.org/stable/c/1403f1221a35a6caf959bb7bf005741f17263c66
- https://git.kernel.org/stable/c/39f59bf67231ed2eb0cdf6337194360e964b609a
- https://git.kernel.org/stable/c/3f2dc01b9cb516d4727a3b9263ee58c71ca00ba9
- https://git.kernel.org/stable/c/bca74fff138429f3d5802865f38fc883d53a4f1a
- https://git.kernel.org/stable/c/d7c677feb3aa1f42b1026d75a8ea61338b51e4fb
- https://git.kernel.org/stable/c/ddfbd816273b4e9c9b836f5b8773664c6f40f807
- https://git.kernel.org/stable/c/f16a1513452edb532fec81e591c64c320866719c