commit 0bf9ccffd2f90dfdd6a26814e77750c68d4598e6
author Namjae Jeon <linkinjeon@kernel.org> Thu Jul 13 16:40:35 2023 +0900
committer Namjae Jeon <linkinjeon@kernel.org> Fri Jul 14 17:10:50 2023 +0900
tree 77b8fe697dbea8b767c66ccc26f438344f9498a5
parent 17c7881225a35acdea24e3ca72ed94ae2918c7d1

exfat: check if filename entries exceeds max filename length

exfat_extract_uni_name copies characters from a given file name entry into
the 'uniname' variable. This variable is actually defined on the stack of
the exfat_readdir() function. According to the definition of
the 'exfat_uni_name' type, the file name should be limited 255 characters
(+ null teminator space), but the exfat_get_uniname_from_ext_entry()
function can write more characters because there is no check if filename
entries exceeds max filename length. This patch add the check not to copy
filename characters when exceeding max filename length.

Cc: stable@vger.kernel.org
Cc: Yuezhang Mo <Yuezhang.Mo@sony.com>
Reported-by: Maxim Suhanov <dfirblog@gmail.com>
Reviewed-by: Sungjong Seo <sj1557.seo@samsung.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>