projects
/
platform
/
kernel
/
linux-starfive.git
/ commitdiff
commit
grep
author
committer
pickaxe
?
search:
re
summary
|
shortlog
|
log
|
commit
| commitdiff |
tree
raw
|
patch
| inline |
side by side
(parent:
d456564
)
should_follow_link(): validate ->d_seq after having decided to follow
author
Al Viro
<viro@zeniv.linux.org.uk>
Sun, 28 Feb 2016 00:31:01 +0000
(19:31 -0500)
committer
Al Viro
<viro@zeniv.linux.org.uk>
Sun, 28 Feb 2016 00:31:01 +0000
(19:31 -0500)
... otherwise d_is_symlink() above might have nothing to do with
the inode value we've got.
Cc: stable@vger.kernel.org # v4.2+
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
fs/namei.c
patch
|
blob
|
history
diff --git
a/fs/namei.c
b/fs/namei.c
index
e0881c0
..
65a0e9d
100644
(file)
--- a/
fs/namei.c
+++ b/
fs/namei.c
@@
-1712,6
+1712,11
@@
static inline int should_follow_link(struct nameidata *nd, struct path *link,
return 0;
if (!follow)
return 0;
+ /* make sure that d_is_symlink above matches inode */
+ if (nd->flags & LOOKUP_RCU) {
+ if (read_seqcount_retry(&link->dentry->d_seq, seq))
+ return -ECHILD;
+ }
return pick_link(nd, link, inode, seq);
}