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Change History

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

NFS: Fix a race when updating an existing write

After nfs_lock_and_join_requests() tests for whether the request is
still attached to the mapping, nothing prevents a call to
nfs_inode_remove_request() from succeeding until we actually lock the
page group.
The reason is that whoever called nfs_inode_remove_request() doesn't
necessarily have a lock on the page group head.

So in order to avoid races, let's take the page group lock earlier in
nfs_lock_and_join_requests(), and hold it across the removal of the
request in nfs_inode_remove_request().

https://git.kernel.org/stable/c/202a3432d21ac060629a760fff3b0a39859da3ea

https://git.kernel.org/stable/c/76d2e3890fb169168c73f2e4f8375c7cc24a765e

https://git.kernel.org/stable/c/92278ae36935a54e65fef9f8ea8efe7e80481ace