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See <http://lists.gnu.org/archive/html/bug-patch/2015-06/msg00009.html>
From 0507dfad5f060161f01840067e1bb1615257b636 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ludovic=20Court=C3=A8s?= <ludo@gnu.org>
Date: Mon, 8 Jun 2015 17:27:56 +0200
Subject: [PATCH] Do not rely on PATH_MAX when reading a symlink target.
* src/util.c (move_file, copy_file): Use 'fromst->st_size + 1' and
'tost->st_size + 1' for the allocation, and 'fromst->st_size' and
'tost->st_size' instead of PATH_MAX. Fixes compilation on GNU/Hurd.
---
src/util.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/src/util.c b/src/util.c
index 1cc08ba..67dbd3a 100644
--- a/src/util.c
+++ b/src/util.c
@@ -460,12 +460,12 @@ move_file (char const *from, bool *from_needs_removal,
/* FROM contains the contents of the symlink we have patched; need
to convert that back into a symlink. */
- char *buffer = xmalloc (PATH_MAX);
+ char *buffer = xmalloc (fromst->st_size + 1);
int fd, size = 0, i;
if ((fd = safe_open (from, O_RDONLY | O_BINARY, 0)) < 0)
pfatal ("Can't reopen file %s", quotearg (from));
- while ((i = read (fd, buffer + size, PATH_MAX - size)) > 0)
+ while ((i = read (fd, buffer + size, fromst->st_size - size)) > 0)
size += i;
if (i != 0 || close (fd) != 0)
read_fatal ();
@@ -610,10 +610,10 @@ copy_file (char const *from, char const *to, struct stat *tost,
if (S_ISLNK (mode))
{
- char *buffer = xmalloc (PATH_MAX + 1);
+ char *buffer = xmalloc (tost->st_size + 1);
ssize_t r;
- if ((r = safe_readlink (from, buffer, PATH_MAX)) < 0)
+ if ((r = safe_readlink (from, buffer, tost->st_size)) < 0)
pfatal ("Can't read %s %s", "symbolic link", from);
buffer[r] = '\0';
if (safe_symlink (buffer, to) != 0)
--
2.16.2
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