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exfat: fix double free in delayed_free

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[ Upstream commit 1f3d9724e16d62c7d42c67d6613b8512f2887c22 ]

The double free could happen in the following path.

exfat_create_upcase_table()
        exfat_create_upcase_table() : return error
        exfat_free_upcase_table() : free ->vol_utbl
        exfat_load_default_upcase_table : return error
     exfat_kill_sb()
           delayed_free()
                  exfat_free_upcase_table() <--------- double free
This patch set ->vol_util as NULL after freeing it.

Reported-by: Jianzhou Zhao <xnxc22xnxc22@qq.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Namjae Jeon
2025-04-01 13:50:39 +09:00
committed by Greg Kroah-Hartman
parent 9c26758b3f
commit 13d8de1b65
1 changed files with 1 additions and 0 deletions
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fs/exfat/nls.c
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@@ -804,4 +804,5 @@ load_default:
void exfat_free_upcase_table(struct exfat_sb_info *sbi)
{
kvfree(sbi->vol_utbl);
sbi->vol_utbl = NULL;
}