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Fix bug in realpath implementation bundled with pmount which caused it to
likely fail on paths with several symlinks.
The issue was first noticed by failure in tests:
Gentoo-Bug: https://bugs.gentoo.org/741810
--- pmount-0.9.99-alpha/src/realpath.c.orig 2024-01-21 09:19:55.776224329 +0300
+++ pmount-0.9.99-alpha/src/realpath.c 2024-01-21 09:30:46.751233027 +0300
@@ -128,6 +128,7 @@
} else {
#ifdef resolve_symlinks /* Richard Gooch dislikes sl resolution */
int m;
+ char *old_buf;
/* Note: readlink doesn't add the null byte. */
link_path[n] = '\0';
@@ -141,12 +142,13 @@
/* Insert symlink contents into path. */
m = strlen(path);
- if (buf)
- free(buf);
+ old_buf = buf; /* path might point to buf at this point */
buf = xmalloc(m + n + 1);
memcpy(buf, link_path, n);
memcpy(buf + n, path, m + 1);
path = buf;
+ if (old_buf)
+ free(old_buf);
#endif
}
*npath++ = '/';
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