exfat: move freeing sbi, upcase table and dropping nls into rcu-delayed helper

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That stuff can be accessed by ->d_hash()/->d_compare(); as it is, we have
a hard-to-hit UAF if rcu pathwalk manages to get into ->d_hash() on a filesystem
that is in process of getting shut down.

Besides, having nls and upcase table cleanup moved from ->put_super() towards
the place where sbi is freed makes for simpler failure exits.

Acked-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

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Al Viro 2023-09-19 15:53:32 -04:00

parent 529f89a9e4

commit a13d1a4de3

3 changed files with 16 additions and 19 deletions

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1

fs/exfat/exfat_fs.h

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14

fs/exfat/nls.c

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20

fs/exfat/super.c

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