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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>
This commit is contained in:
Oleg Nesterov 2012-07-29 20:22:29 +02:00 коммит произвёл Ingo Molnar
Родитель 9f92448cee
Коммит 665605a2a2
1 изменённых файлов: 4 добавлений и 4 удалений
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8
kernel/events/uprobes.c
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@ -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) {