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Change History

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().

https://git.kernel.org/stable/c/46819f604557fe7bc39a6c352fd368371aa9cd6e

https://git.kernel.org/stable/c/55513864b418c6453d68aebc36cffcf965342426

https://git.kernel.org/stable/c/5559405df652008e56eee88872126fe4c451da67