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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: Fri, 4 Dec 2020 15:04:28 +0000
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Subject: [PATCH] util/glue-efi: Fix incorrect use of a possibly negative value
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It is possible for the ftell() function to return a negative value,
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although it is fairly unlikely here, we should be checking for
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a negative value before we assign it to an unsigned value.
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Fixes: CID 73744
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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/glue-efi.c | 14 ++++++++++++--
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1 file changed, 12 insertions(+), 2 deletions(-)
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diff --git a/util/glue-efi.c b/util/glue-efi.c
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index 68f53168b58..de0fa6d33d5 100644
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--- a/util/glue-efi.c
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+++ b/util/glue-efi.c
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@@ -39,13 +39,23 @@ write_fat (FILE *in32, FILE *in64, FILE *out, const char *out_filename,
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struct grub_macho_fat_header head;
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struct grub_macho_fat_arch arch32, arch64;
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grub_uint32_t size32, size64;
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+ long size;
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char *buf;
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fseek (in32, 0, SEEK_END);
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- size32 = ftell (in32);
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+ size = ftell (in32);
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+ if (size < 0)
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+ grub_util_error ("cannot get end of input file '%s': %s",
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+ name32, strerror (errno));
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+ size32 = (grub_uint32_t) size;
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fseek (in32, 0, SEEK_SET);
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+
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fseek (in64, 0, SEEK_END);
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- size64 = ftell (in64);
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+ size = ftell (in64);
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+ if (size < 0)
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+ grub_util_error ("cannot get end of input file '%s': %s",
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+ name64, strerror (errno));
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+ size64 = (grub_uint64_t) size;
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fseek (in64, 0, SEEK_SET);
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head.magic = grub_cpu_to_le32_compile_time (GRUB_MACHO_FAT_EFI_MAGIC);
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