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From f02e9004303df5ab3d9b868f6f60af44663cce69 Mon Sep 17 00:00:00 2001
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From: Karel Zak <kzak@redhat.com>
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Date: Tue, 19 Apr 2022 09:44:07 +0200
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Subject: libblkid: check fsync() return code
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Since 39f5af25982d8b0244000e92a9d0e0e6557d0e17 libblkid uses
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O_NONBLOCK. Now it's more obvious that check fsync() (and close())
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return value after write() is always a good idea ...
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Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=2074486
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Upstream: http://github.com/util-linux/util-linux/commit/133a0d70f637b4f4e4337811e452153b04f2bdcf
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Signed-off-by: Karel Zak <kzak@redhat.com>
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---
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libblkid/src/probe.c | 5 ++++-
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misc-utils/wipefs.c | 8 ++++++--
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2 files changed, 10 insertions(+), 3 deletions(-)
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diff --git a/libblkid/src/probe.c b/libblkid/src/probe.c
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index 5f01bc3b3..d317dc19a 100644
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--- a/libblkid/src/probe.c
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+++ b/libblkid/src/probe.c
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@@ -1298,7 +1298,10 @@ int blkid_do_wipe(blkid_probe pr, int dryrun)
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/* wipen on device */
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if (write_all(fd, buf, len))
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return -1;
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- fsync(fd);
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+
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+ if (fsync(fd) != 0)
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+ return -1;
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+
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pr->flags &= ~BLKID_FL_MODIF_BUFF; /* be paranoid */
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return blkid_probe_step_back(pr);
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diff --git a/misc-utils/wipefs.c b/misc-utils/wipefs.c
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index 78dc63ee7..f08a9ba4f 100644
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--- a/misc-utils/wipefs.c
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+++ b/misc-utils/wipefs.c
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@@ -615,7 +615,9 @@ static int do_wipe(struct wipe_control *ctl)
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if (need_force)
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warnx(_("Use the --force option to force erase."));
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- fsync(blkid_probe_get_fd(pr));
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+ if (fsync(blkid_probe_get_fd(pr)) != 0)
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+ err(EXIT_FAILURE, _("%s: cannot flush modified buffers"),
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+ ctl->devname);
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#ifdef BLKRRPART
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if (reread && (mode & O_EXCL)) {
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@@ -635,7 +637,9 @@ static int do_wipe(struct wipe_control *ctl)
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}
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#endif
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- close(blkid_probe_get_fd(pr));
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+ if (close(blkid_probe_get_fd(pr)) != 0)
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+ err(EXIT_FAILURE, _("%s: close device failed"), ctl->devname);
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+
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blkid_free_probe(pr);
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free(backup);
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return 0;
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--
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2.36.1
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