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exfat: check if filename entries exceeds max filename length 

[ Upstream commit d42334578e ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Namjae Jeon 2023-07-13 21:59:37 +09:00 committed by Greg Kroah-Hartman
parent e2fb24ce37
commit c2fdf827f8
1 changed files with 7 additions and 2 deletions
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9
fs/exfat/dir.c
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@ -34,6 +34,7 @@ static void exfat_get_uniname_from_ext_entry(struct super_block *sb,
{ {
int i; int i;
struct exfat_entry_set_cache *es; struct exfat_entry_set_cache *es;
unsigned int uni_len = 0, len;
es = exfat_get_dentry_set(sb, p_dir, entry, ES_ALL_ENTRIES); es = exfat_get_dentry_set(sb, p_dir, entry, ES_ALL_ENTRIES);
if (!es) if (!es)
@ -52,7 +53,10 @@ static void exfat_get_uniname_from_ext_entry(struct super_block *sb,
if (exfat_get_entry_type(ep) != TYPE_EXTEND) if (exfat_get_entry_type(ep) != TYPE_EXTEND)
break; break;
exfat_extract_uni_name(ep, uniname); len = exfat_extract_uni_name(ep, uniname);
uni_len += len;
if (len != EXFAT_FILE_NAME_LEN || uni_len >= MAX_NAME_LENGTH)
break;
uniname += EXFAT_FILE_NAME_LEN; uniname += EXFAT_FILE_NAME_LEN;
} }
@ -1024,7 +1028,8 @@ int exfat_find_dir_entry(struct super_block *sb, struct exfat_inode_info *ei,
if (entry_type == TYPE_EXTEND) { if (entry_type == TYPE_EXTEND) {
unsigned short entry_uniname[16], unichar; unsigned short entry_uniname[16], unichar;
if (step != DIRENT_STEP_NAME) { if (step != DIRENT_STEP_NAME ||
name_len >= MAX_NAME_LENGTH) {
step = DIRENT_STEP_FILE; step = DIRENT_STEP_FILE;
continue; continue;
} }