From 6ecd6fdcc27f374debcce47366c2862967f99463 Mon Sep 17 00:00:00 2001 From: Yu Watanabe Date: Wed, 1 Sep 2021 09:44:26 +0900 Subject: [PATCH] udev-node: check stack directory change even if devlink is removed Otherwise, when multiple device additions and removals occur simultaneously, symlink to unexisting devnode may be created. Hopefully fixes #19946. (cherry picked from commit 1cd4e325693007b3628f1a27297f0ab7114b24b8) Related: #1977994 --- src/udev/udev-node.c | 15 ++++++--------- 1 file changed, 6 insertions(+), 9 deletions(-) diff --git a/src/udev/udev-node.c b/src/udev/udev-node.c index 46c04fe00b..28e6e8df94 100644 --- a/src/udev/udev-node.c +++ b/src/udev/udev-node.c @@ -468,15 +468,12 @@ static int link_update(sd_device *dev, const char *slink_in, bool add) { if (r < 0) return r; - /* Skip the second stat() if the first failed, stat_inode_unmodified() would return false regardless. */ - if ((st1.st_mode & S_IFMT) != 0) { - r = stat(dirname, &st2); - if (r < 0 && errno != ENOENT) - return log_device_debug_errno(dev, errno, "Failed to stat %s: %m", dirname); - - if (stat_inode_unmodified(&st1, &st2)) - break; - } + if (stat(dirname, &st2) < 0 && errno != ENOENT) + return log_device_debug_errno(dev, errno, "Failed to stat %s: %m", dirname); + + if (((st1.st_mode & S_IFMT) == 0 && (st2.st_mode & S_IFMT) == 0) || + stat_inode_unmodified(&st1, &st2)) + return 0; } return i < LINK_UPDATE_MAX_RETRIES ? 0 : -ELOOP;