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-rw-r--r--disk-utils/isosize.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/disk-utils/isosize.c b/disk-utils/isosize.c
index 5ae5a9e1b..e35be6c7c 100644
--- a/disk-utils/isosize.c
+++ b/disk-utils/isosize.c
@@ -138,7 +138,7 @@ static void isosize(int argc, char *filenamep, int xflag, long divisor)
if (lseek(fd, 16 << 11, 0) == (off_t) - 1)
err(EXIT_FAILURE, _("seek error on %s"), filenamep);
- if (read(fd, &ipd, sizeof(ipd)) != (ssize_t) sizeof(ipd))
+ if (read(fd, &ipd, sizeof(ipd)) <= 0)
err(EXIT_FAILURE, _("read error on %s"), filenamep);
nsecs = isonum_733(ipd.volume_space_size, xflag);