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

dm era: fix NULL pointer dereference in metadata_open()

metadata_open() returns NULL when kzalloc_obj() fails, but the
caller era_ctr() only checks IS_ERR(md).  Since IS_ERR(NULL)
returns false, the NULL pointer is treated as a valid result
and later assigned to era->md, leading to a NULL pointer
dereference when the metadata is accessed.

Fix this by returning ERR_PTR(-ENOMEM) on allocation failure,
consistent with dm-cache-metadata.c, dm-thin-metadata.c, and
dm-clone-metadata.c which all use ERR_PTR(-ENOMEM) for the
same pattern.

https://git.kernel.org/stable/c/01c49eae7c6256f2d8cc08210a2bac3ee070e43a

https://git.kernel.org/stable/c/14e03ecd3b1b5fc03c082b27a2f8889f8290c30e

https://git.kernel.org/stable/c/17eb2ab13edd0b06ce6f996c5fd450d7efabb2e8

https://git.kernel.org/stable/c/889374b8e4a60d13fe4a5a8ae3a311ca93d1a2c3

https://git.kernel.org/stable/c/9ae672606c17891d90b282e3490b817620549599

https://git.kernel.org/stable/c/a705e056c2f3dd067fb2ff414f0537530baa090b

https://git.kernel.org/stable/c/b69ea153d30ce19ca8997eeeca1e2219fae5a29b

https://git.kernel.org/stable/c/bd5a80128bdfc93b1cae935a70da000b8c483e6e

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