5.10-stable review patch. If anyone has any objections, please let me know.
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From: Namjae Jeon linkinjeon@kernel.org
[ 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 --- fs/exfat/nls.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/fs/exfat/nls.c b/fs/exfat/nls.c index 314d5407a1be5..a75d5fb2404c7 100644 --- a/fs/exfat/nls.c +++ b/fs/exfat/nls.c @@ -804,4 +804,5 @@ int exfat_create_upcase_table(struct super_block *sb) void exfat_free_upcase_table(struct exfat_sb_info *sbi) { kvfree(sbi->vol_utbl); + sbi->vol_utbl = NULL; }