Use receive_fd() to receive file from another process instead of
combination of get_unused_fd_flags() and fd_install(). This simplifies
the logic and also makes sure we don't miss any security stuff.
Signed-off-by: Xie Yongji <xieyon...@bytedance.com>
---
drivers/android/binder.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index c119736ca56a..080bcab7d632 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -3728,7 +3728,7 @@ static int binder_apply_fd_fixups(struct binder_proc
*proc,
int ret = 0;
list_for_each_entry(fixup, &t->fd_fixups, fixup_entry) {
- int fd = get_unused_fd_flags(O_CLOEXEC);
+ int fd = receive_fd(fixup->file, O_CLOEXEC);
if (fd < 0) {
binder_debug(BINDER_DEBUG_TRANSACTION,
@@ -3741,7 +3741,7 @@ static int binder_apply_fd_fixups(struct binder_proc
*proc,
"fd fixup txn %d fd %d\n",
t->debug_id, fd);
trace_binder_transaction_fd_recv(t, fd, fixup->offset);
- fd_install(fd, fixup->file);
+ fput(fixup->file);
fixup->file = NULL;
if (binder_alloc_copy_to_buffer(&proc->alloc, t->buffer,
fixup->offset, &fd,
--
2.11.0
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