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elfcopy: fail if debug link target is empty

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An empty debug link target previously returned a confusing and incorrect
error like "objcopy: fread failed: No error: 0". Now, return an explicit
error.

GNU objcopy allows an empty file as the debug link target. However,
that case is nonsensical so diverging from GNU behaviour is fine.

Reviewed by:	bdrewery
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D5541
This commit is contained in:
Ed Maste 2016-03-04 18:28:19 +00:00
parent 8b66d3d3bd
commit f5e9c916af
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=296391
1 changed files with 3 additions and 0 deletions
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3
contrib/elftoolchain/elfcopy/sections.c
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@ -1522,6 +1522,9 @@ add_gnu_debuglink(struct elfcopy *ecp)
err(EXIT_FAILURE, "strdup failed");
if (stat(ecp->debuglink, &sb) == -1)
err(EXIT_FAILURE, "stat failed");
if (sb.st_size == 0)
errx(EXIT_FAILURE, "empty debug link target %s",
ecp->debuglink);
if ((buf = malloc(sb.st_size)) == NULL)
err(EXIT_FAILURE, "malloc failed");
if ((fp = fopen(ecp->debuglink, "r")) == NULL)