From: Thomas Weißschuh <thomas@t-8ch.de>
Date: Mon, 2 Oct 2023 11:01:47 +0000 (+0200)
Subject: libfdisk: reset errno before calling read()
X-Git-Tag: v2.39.3~40
X-Git-Url: http://git.ipfire.org/gitweb/gitweb.cgi?a=commitdiff_plain;h=41599054c7248f12c8a54d02f7161d0aff4275a9;p=thirdparty%2Futil-linux.git

libfdisk: reset errno before calling read()

The else branch will be executed on short reads.
For those errno is not reset so a random left-over errno value may be
checked.

Signed-off-by: Thomas Weißschuh <thomas@t-8ch.de>
---

diff --git a/libfdisk/src/utils.c b/libfdisk/src/utils.c
index 38ad233933..6b6167d478 100644
--- a/libfdisk/src/utils.c
+++ b/libfdisk/src/utils.c
@@ -29,6 +29,7 @@ static int read_from_device(struct fdisk_context *cxt,
 		return -errno;
 	}
 
+	errno = 0;
 	r = read(cxt->dev_fd, buf, size);
 	if (r < 0 || (size_t)r != size) {
 		if (!errno)