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-rw-r--r--block/file-posix.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/block/file-posix.c b/block/file-posix.c
index c4c06637ef..ac6bd9fae8 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -686,7 +686,7 @@ static int hdev_get_max_segments(const struct stat *st)
goto out;
}
do {
- ret = read(fd, buf, sizeof(buf));
+ ret = read(fd, buf, sizeof(buf) - 1);
} while (ret == -1 && errno == EINTR);
if (ret < 0) {
ret = -errno;