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authorDan Carpenter <dan.carpenter@oracle.com>2017-05-22 15:08:31 +0300
committerMike Marshall <hubcap@omnibond.com>2017-09-14 14:58:27 -0400
commit5f13e58767a53ebb54265e03c0c4a67650286263 (patch)
tree8e7a067fbf6b4d8b55d3ee1f336d731d172520fb
parentba5e79ea183a2b809a9bbd2f8d76dc69ca32a92b (diff)
orangefs: off by ones in xattr size checks
A previous patch which claimed to remove off by ones actually introduced them. strlen() returns the length of the string not including the NUL character. We are using strcpy() to copy "name" into a buffer which is ORANGEFS_MAX_XATTR_NAMELEN characters long. We should make sure to leave space for the NUL, otherwise we're writing one character beyond the end of the buffer. Fixes: e675c5ec51fe ("orangefs: clean up oversize xattr validation") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Mike Marshall <hubcap@omnibond.com>
-rw-r--r--fs/orangefs/xattr.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/orangefs/xattr.c b/fs/orangefs/xattr.c
index 237c9c04dc3b..a34b25be39c5 100644
--- a/fs/orangefs/xattr.c
+++ b/fs/orangefs/xattr.c
@@ -76,7 +76,7 @@ ssize_t orangefs_inode_getxattr(struct inode *inode, const char *name,
if (S_ISLNK(inode->i_mode))
return -EOPNOTSUPP;
- if (strlen(name) > ORANGEFS_MAX_XATTR_NAMELEN)
+ if (strlen(name) >= ORANGEFS_MAX_XATTR_NAMELEN)
return -EINVAL;
fsuid = from_kuid(&init_user_ns, current_fsuid());
@@ -169,7 +169,7 @@ static int orangefs_inode_removexattr(struct inode *inode, const char *name,
struct orangefs_kernel_op_s *new_op = NULL;
int ret = -ENOMEM;
- if (strlen(name) > ORANGEFS_MAX_XATTR_NAMELEN)
+ if (strlen(name) >= ORANGEFS_MAX_XATTR_NAMELEN)
return -EINVAL;
down_write(&orangefs_inode->xattr_sem);
@@ -233,7 +233,7 @@ int orangefs_inode_setxattr(struct inode *inode, const char *name,
if (size > ORANGEFS_MAX_XATTR_VALUELEN)
return -EINVAL;
- if (strlen(name) > ORANGEFS_MAX_XATTR_NAMELEN)
+ if (strlen(name) >= ORANGEFS_MAX_XATTR_NAMELEN)
return -EINVAL;
internal_flag = convert_to_internal_xattr_flags(flags);