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From 3d68daf2567aace4b52bd238cfd4a8111af3bc04 Mon Sep 17 00:00:00 2001
From: Darren Kenny <darren.kenny@oracle.com>
Date: Thu, 5 Nov 2020 14:33:50 +0000
Subject: [PATCH] util/grub-editenv: Fix incorrect casting of a signed value
The return value of ftell() may be negative (-1) on error. While it is
probably unlikely to occur, we should not blindly cast to an unsigned
value without first testing that it is not negative.
Fixes: CID 73856
Signed-off-by: Darren Kenny <darren.kenny@oracle.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Upstream-Status: Backport [https://git.savannah.gnu.org/cgit/grub.git/commit/?id=5dc41edc4eba259c6043ae7698c245ec1baaacc6]
Signed-off-by: Marta Rybczynska <marta.rybczynska@huawei.com>
---
util/grub-editenv.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/util/grub-editenv.c b/util/grub-editenv.c
index f3662c9..db6f187 100644
--- a/util/grub-editenv.c
+++ b/util/grub-editenv.c
@@ -125,6 +125,7 @@ open_envblk_file (const char *name)
{
FILE *fp;
char *buf;
+ long loc;
size_t size;
grub_envblk_t envblk;
@@ -143,7 +144,12 @@ open_envblk_file (const char *name)
grub_util_error (_("cannot seek `%s': %s"), name,
strerror (errno));
- size = (size_t) ftell (fp);
+ loc = ftell (fp);
+ if (loc < 0)
+ grub_util_error (_("cannot get file location `%s': %s"), name,
+ strerror (errno));
+
+ size = (size_t) loc;
if (fseek (fp, 0, SEEK_SET) < 0)
grub_util_error (_("cannot seek `%s': %s"), name,
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