linux-kernel - [PATCH v2] fs/adfs: bigdir: Restore EIO errno return when checkbyte mismatch

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-Id: <20250805073040.192968-1-zhen.ni@easystack.cn>
Date: Tue,  5 Aug 2025 15:30:40 +0800
From: Zhen Ni <zhen.ni@...ystack.cn>
To: Markus.Elfring@....de,
	viro@...iv.linux.org.uk,
	linux@...linux.org.uk,
	rmk+kernel@...linux.org.uk
Cc: linux-kernel@...r.kernel.org,
	Zhen Ni <zhen.ni@...ystack.cn>,
	stable@...r.kernel.org
Subject: [PATCH v2] fs/adfs: bigdir: Restore EIO errno return when checkbyte mismatch

The error path in adfs_fplus_read() prints an error message via
adfs_error() but incorrectly returns success (0) to the caller.
This occurs because the 'ret' variable remains set to 0 from the earlier
successful call to adfs_fplus_validate_tail().

Fix by setting 'ret = -EIO' before jumping to the error exit.

This issue was detected by smatch static analysis:
warning: fs/adfs/dir_fplus.c:146: adfs_fplus_read() warn: missing error
code 'ret'.

Fixes: d79288b4f61b ("fs/adfs: bigdir: calculate and validate directory checkbyte")
Cc: stable@...r.kernel.org
Signed-off-by: Zhen Ni <zhen.ni@...ystack.cn>
---
Changes in v2:
- Add tags of 'Fixes' and 'Cc' in commit message
- Added error description and the corresponding fix in commit message
---
 fs/adfs/dir_fplus.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/adfs/dir_fplus.c b/fs/adfs/dir_fplus.c
index 4a15924014da..4334279409b2 100644
--- a/fs/adfs/dir_fplus.c
+++ b/fs/adfs/dir_fplus.c
@@ -143,6 +143,7 @@ static int adfs_fplus_read(struct super_block *sb, u32 indaddr,
 
 	if (adfs_fplus_checkbyte(dir) != t->bigdircheckbyte) {
 		adfs_error(sb, "dir %06x checkbyte mismatch\n", indaddr);
+		ret = -EIO;
 		goto out;
 	}
 
-- 
2.20.1