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notify_change(): check that i_mutex is held 

Cc: Djalal Harouni <tixxdz@opendz.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Andrew Morton 2012-06-20 09:55:58 +10:00 committed by Al Viro
parent b5fb63c183
commit c4107b3097
1 changed files with 2 additions and 1 deletions
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3
fs/attr.c
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@ -171,6 +171,8 @@ int notify_change(struct dentry * dentry, struct iattr * attr)
struct timespec now;
unsigned int ia_valid = attr->ia_valid;
WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex));
if (ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID | ATTR_TIMES_SET)) {
if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
return -EPERM;
@ -250,5 +252,4 @@ int notify_change(struct dentry * dentry, struct iattr * attr)
return error;
}
EXPORT_SYMBOL(notify_change);