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binder: fix handling of error during copy

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[ Upstream commit fe6b186924 ]

If a memory copy function fails to copy the whole buffer,
a positive integar with the remaining bytes is returned.
In binder_translate_fd_array() this can result in an fd being
skipped due to the failed copy, but the loop continues
processing fds since the early return condition expects a
negative integer on error.

Fix by returning "ret > 0 ? -EINVAL : ret" to handle this case.

Fixes: bb4a2e48d5 ("binder: return errors from buffer copy functions")
Suggested-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Todd Kjos <tkjos@google.com>
Link: https://lore.kernel.org/r/20211130185152.437403-2-tkjos@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Todd Kjos 2021-11-30 10:51:49 -08:00 • committed by Justin Hammond
parent 81312081b2
commit c282e32861
1 changed files with 2 additions and 2 deletions
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4
drivers/android/binder.c
View file

@ -2269,8 +2269,8 @@ static int binder_translate_fd_array(struct binder_fd_array_object *fda,
if (!ret)
ret = binder_translate_fd(fd, offset, t, thread,
in_reply_to);
if (ret < 0)
return ret;
if (ret)
return ret > 0 ? -EINVAL : ret;
}
return 0;
}