smb: client: clear ce->tgthint in free_tgts()

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When free_tgts() frees all structures in ce->tlist, ce->tgthint
is left pointing to one of the freed cache_dfs_tgt structures.

If ce->tgthint is not reset before it is used later, it results
in a use-after-free.

Set ce->tgthint to NULL in free_tgts() after the elements are
freed to reflect that no elements remain.

Fixes: 54be1f6c1c ("cifs: Add DFS cache routines")
Cc: stable@vger.kernel.org # depends on: smb: client: harden DFS cache against invalid target hints
Signed-off-by: Fredric Cover <fredric.cover.lkernel@gmail.com>
Reviewed-by: ChenXiaoSong <chenxiaosong@kylinos.cn>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Paulo Alcantara <pc@manguebit.org>

...

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Fredric Cover 2026-07-24 15:01:46 -07:00 • committed by Paulo Alcantara

parent bf86c08123

commit b1b741cf8e

1 changed files with 2 additions and 0 deletions

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fs/smb/client/dfs_cache.c

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