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| author |   Oleg Nesterov <oleg@redhat.com> | 2012-07-29 20:22:29 +0200 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2012-07-30 11:27:20 +0200 |
| commit | 665605a2a207dbe1fa429b474f932d6ea138ba92 (patch) | |
| tree | a9f99fcb3972a73066af4591dd3e818b8b14ab27 /kernel | |
| parent | uprobes: Clean up and document write_opcode()->lock_page(old_page) (diff) | |
| download | linux-dev-665605a2a207dbe1fa429b474f932d6ea138ba92.tar.xz linux-dev-665605a2a207dbe1fa429b474f932d6ea138ba92.zip | |
uprobes: Uprobe_mmap/munmap needs list_for_each_entry_safe()
The bug was introduced by me in 449d0d7c ("uprobes: Simplify the
usage of uprobe->pending_list").
Yes, we do not care about uprobe->pending_list after return and
nobody can remove the current list entry, but put_uprobe(uprobe)
can actually free it and thus we need list_for_each_safe().
Reported-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Srikar Dronamraju <srikar.vnet.ibm.com>
Cc: Anton Arapov <anton@redhat.com>
Link: http://lkml.kernel.org/r/20120729182229.GA20329@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/events/uprobes.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index 5db150b306d2..bed2161620d7 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -1010,7 +1010,7 @@ static void build_probe_list(struct inode *inode, struct list_head *head) int uprobe_mmap(struct vm_area_struct *vma) { struct list_head tmp_list; - struct uprobe *uprobe; + struct uprobe *uprobe, *u; struct inode *inode; int ret, count; @@ -1028,7 +1028,7 @@ int uprobe_mmap(struct vm_area_struct *vma) ret = 0; count = 0; - list_for_each_entry(uprobe, &tmp_list, pending_list) { + list_for_each_entry_safe(uprobe, u, &tmp_list, pending_list) { if (!ret) { loff_t vaddr = vma_address(vma, uprobe->offset); @@ -1076,7 +1076,7 @@ int uprobe_mmap(struct vm_area_struct *vma) void uprobe_munmap(struct vm_area_struct *vma, unsigned long start, unsigned long end) { struct list_head tmp_list; - struct uprobe *uprobe; + struct uprobe *uprobe, *u; struct inode *inode; if (!atomic_read(&uprobe_events) || !valid_vma(vma, false)) @@ -1093,7 +1093,7 @@ void uprobe_munmap(struct vm_area_struct *vma, unsigned long start, unsigned lon mutex_lock(uprobes_mmap_hash(inode)); build_probe_list(inode, &tmp_list); - list_for_each_entry(uprobe, &tmp_list, pending_list) { + list_for_each_entry_safe(uprobe, u, &tmp_list, pending_list) { loff_t vaddr = vma_address(vma, uprobe->offset); if (vaddr >= start && vaddr < end) { |