cifs: check MaxPathNameComponentLength != 0 before using it

PATCH New Ronnie Sahlberg 1 participant 1 message Oct 25, 2017

Subsystems (2)

SMB client (CIFS) Kernel SMB3 server (ksmbd)

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Ronnie Sahlberg

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2017-10-25 22:31 UTC #0 lore raw

PATCH 1/1 cifs: check MaxPathNameComponentLength != 0 before using it

Signed-off-by Ronnie Sahlberg <[email protected]>

---
 fs/cifs/dir.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

fs/cifs/dir.c +2 -1

index e702d48bd023..513ff2986c97 100644
@@ -204,7 +204,8 @@ check_name(struct dentry *direntry, struct cifs_tcon *tcon)
 	struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
 	int i;
 
-	if (unlikely(direntry->d_name.len >
+	if (unlikely(tcon->fsAttrInfo.MaxPathNameComponentLength &&
+		     direntry->d_name.len >
 		     le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength)))
 		return -ENAMETOOLONG;

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