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authorOleg Nesterov <oleg@redhat.com>2012-11-21 18:01:43 +0100
committerOleg Nesterov <oleg@redhat.com>2013-02-08 17:47:01 +0100
commitf0744af7d0fde190674064c54e2ff60b34ac71fe (patch)
tree1fbe365e02f6d11c1a8837689578ef9b0874f0fa /kernel/events
parentbbc33d05930f870ea049eae5ed980f8b827d0813 (diff)
downloadlinux-f0744af7d0fde190674064c54e2ff60b34ac71fe.tar.bz2
uprobes: Kill the pointless inode/uc checks in register/unregister
register/unregister verifies that inode/uc != NULL. For what? This really looks like "hide the potential problem", the caller should pass the valid data. register() also checks uc->next == NULL, probably to prevent the double-register but the caller can do other stupid/wrong things. If we do this check, then we should document that uc->next should be cleared before register() and add BUG_ON(). Also add the small comment about the i_size_read() check. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/events')
-rw-r--r--kernel/events/uprobes.c7
1 files changed, 1 insertions, 6 deletions
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index afbab2cb2742..a39d8163b713 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -844,9 +844,7 @@ int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *
struct uprobe *uprobe;
int ret;
- if (!inode || !uc || uc->next)
- return -EINVAL;
-
+ /* Racy, just to catch the obvious mistakes */
if (offset > i_size_read(inode))
return -EINVAL;
@@ -883,9 +881,6 @@ void uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consume
{
struct uprobe *uprobe;
- if (!inode || !uc)
- return;
-
uprobe = find_uprobe(inode, offset);
if (!uprobe)
return;