dm era: fix NULL pointer dereference in metadata_open()

Summary

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.

Timeline

1. Aug 15, 2026, 5:55 AM UTCCVE published
2. Aug 17, 2026, 5:12 AM UTCRecord last updated

Affected versions

• Linux Linux

  Version range not reported

• Linux Linux

  3.15

References 8