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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Darren Kenny <darren.kenny@oracle.com>
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Date: Thu, 5 Nov 2020 14:33:50 +0000
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Subject: [PATCH] util/grub-editenv: Fix incorrect casting of a signed value
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The return value of ftell() may be negative (-1) on error. While it is
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probably unlikely to occur, we should not blindly cast to an unsigned
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value without first testing that it is not negative.
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Fixes: CID 73856
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Signed-off-by: Darren Kenny <darren.kenny@oracle.com>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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---
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util/grub-editenv.c | 8 +++++++-
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1 file changed, 7 insertions(+), 1 deletion(-)
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diff --git a/util/grub-editenv.c b/util/grub-editenv.c
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index 2918bb71cfe..e9011e0fbde 100644
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--- a/util/grub-editenv.c
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+++ b/util/grub-editenv.c
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@@ -128,6 +128,7 @@ open_envblk_file (const char *name)
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{
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FILE *fp;
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char *buf;
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+ long loc;
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size_t size;
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grub_envblk_t envblk;
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@@ -146,7 +147,12 @@ open_envblk_file (const char *name)
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grub_util_error (_("cannot seek `%s': %s"), name,
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strerror (errno));
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- size = (size_t) ftell (fp);
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+ loc = ftell (fp);
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+ if (loc < 0)
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+ grub_util_error (_("cannot get file location `%s': %s"), name,
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+ strerror (errno));
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+
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+ size = (size_t) loc;
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if (fseek (fp, 0, SEEK_SET) < 0)
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grub_util_error (_("cannot seek `%s': %s"), name,
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