Bug 2400761

Summary: kernel: nfs: fix possible null-ptr-deref when parsing param
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerability-draftAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2025-10-01 12:05:57 UTC 
In the Linux kernel, the following vulnerability has been resolved:

nfs: fix possible null-ptr-deref when parsing param

According to commit "vfs: parse: deal with zero length string value",
kernel will set the param->string to null pointer in vfs_parse_fs_string()
if fs string has zero length.

Yet the problem is that, nfs_fs_context_parse_param() will dereferences the
param->string, without checking whether it is a null pointer, which may
trigger a null-ptr-deref bug.

This patch solves it by adding sanity check on param->string
in nfs_fs_context_parse_param().
Comment 1 Jon Moroney 2025-10-01 20:31:15 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025100118-CVE-2022-50455-24fb@gregkh/T