fill_note_info() iterates through the list of threads collected in
mm->core_state->dumper, allocating a struct elf_thread_core_info
instance for each and linking those into a list.
We need the entry corresponding to current to be first in the
resulting list, so the logics for list insertion is
if it's for current or list is empty
insert in the head
else
insert after the first element
However, in mm->core_state->dumper the entry for current is guaranteed
to be the first one. Which means that both parts of condition will
be true on the first iteration and neither will be true on all subsequent
ones.
Taking the first iteration out of the loop simplifies things nicely...
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
---
fs/binfmt_elf.c | 22 ++++++++++------------
1 file changed, 10 insertions(+), 12 deletions(-)
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 4190dafd2ec4..e990075fb43d 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -1866,7 +1866,14 @@ static int fill_note_info(struct elfhdr *elf, int phdrs,
/*
* Allocate a structure for each thread.
*/
- for (ct = &dump_task->signal->core_state->dumper; ct; ct = ct->next) {
+ info->thread = kzalloc(offsetof(struct elf_thread_core_info,
+ notes[info->thread_notes]),
+ GFP_KERNEL);
+ if (unlikely(!info->thread))
+ return 0;
+
+ info->thread->task = dump_task;
+ for (ct = dump_task->signal->core_state->dumper.next; ct; ct = ct->next) {
t = kzalloc(offsetof(struct elf_thread_core_info,
notes[info->thread_notes]),
GFP_KERNEL);
@@ -1874,17 +1881,8 @@ static int fill_note_info(struct elfhdr *elf, int phdrs,
return 0;
t->task = ct->task;
- if (ct->task == dump_task || !info->thread) {
- t->next = info->thread;
- info->thread = t;
- } else {
- /*
- * Make sure to keep the original task at
- * the head of the list.
- */
- t->next = info->thread->next;
- info->thread->next = t;
- }
+ t->next = info->thread->next;
+ info->thread->next = t;
}
/*
--
2.30.2
