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From: Ronnie Sahlberg <lsahlber@redhat.com>
To: linux-cifs <linux-cifs@vger.kernel.org>
Cc: Steve French <smfrench@gmail.com>
Subject: [PATCH] cifs: use the correct max-length for dentry_path_raw()
Date: Tue, 10 Aug 2021 12:36:09 +1000	[thread overview]
Message-ID: <20210810023609.710993-1-lsahlber@redhat.com> (raw)

RHBZ: 1972502

PATH_MAX is 4096 but PAGE_SIZE can be >4096 on some architectures
such as ppc and would thus write beyond the end of the actual object.

CC: Stable <stable@vger.kernel.org>
Suggested-by: Brian foster <bfoster@redhat.com>
Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
---
 fs/cifs/dir.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index 79402ca0ddfa..5f8a302ffcb2 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -100,7 +100,7 @@ build_path_from_dentry_optional_prefix(struct dentry *direntry, void *page,
 	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
 		pplen = cifs_sb->prepath ? strlen(cifs_sb->prepath) + 1 : 0;
 
-	s = dentry_path_raw(direntry, page, PAGE_SIZE);
+	s = dentry_path_raw(direntry, page, PATH_MAX);
 	if (IS_ERR(s))
 		return s;
 	if (!s[1])	// for root we want "", not "/"
-- 
2.30.2


             reply	other threads:[~2021-08-10  2:36 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-10  2:36 Ronnie Sahlberg [this message]
2021-08-10  4:21 ` Steve French
2021-08-10  6:33 Ronnie Sahlberg
2021-08-10 14:44 ` Paulo Alcantara

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