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Fix: Don't strip $libdir from nested module_pathnames

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This patch fixes a bug in how 'load_external_function' handles
'$libdir/ prefixes in module paths.

Previously, 'load_external_function' would unconditionally strip
'$libdir/' from the beginning of the 'filename' string.  This caused
an issue when the path was nested, such as "$libdir/nested/my_lib".
Stripping the prefix resulted in a path of "nested/my_lib", which
would fail to be found by the expand_dynamic_library_name function
because the original '$libdir' macro was removed.

To fix this, the code now checks for the presence of an additional
directory separator ('/' or '\') after the '$libdir/' prefix.  The
prefix is only stripped if the remaining string does not contain a
separator.  This ensures that simple filenames like '"$libdir/my_lib"'
are correctly handled, while nested paths are left intact for
'expand_dynamic_library_name' to process correctly.

Reported-by: Dilip Kumar <dilipbalaut@gmail.com>
Co-authored-by: Matheus Alcantara <matheusssilv97@gmail.com>
Co-authored-by: Dilip Kumar <dilipbalaut@gmail.com>
Reviewed-by: Srinath Reddy Sadipiralla <srinath2133@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/CAFiTN-uKNzAro4tVwtJhF1UqcygfJ%2BR%2BRL%3Db-_ZMYE3LdHoGhA%40mail.gmail.com
This commit is contained in:
Peter Eisentraut
2025-08-27 15:46:39 +02:00
parent ef5b87b970
commit 990c8db182
1 changed files with 11 additions and 4 deletions
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13
src/backend/utils/fmgr/dfmgr.c
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@@ -100,12 +100,19 @@ load_external_function(const char *filename, const char *funcname,
void *retval;
/*
* If the value starts with "$libdir/", strip that. This is because many
* extensions have hardcoded '$libdir/foo' as their library name, which
* prevents using the path.
* For extensions with hardcoded '$libdir/' library names, we strip the
* prefix to allow the library search path to be used. This is done only
* for simple names (e.g., "$libdir/foo"), not for nested paths (e.g.,
* "$libdir/foo/bar").
*
* For nested paths, 'expand_dynamic_library_name' directly expands the
* '$libdir' macro, so we leave them untouched.
*/
if (strncmp(filename, "$libdir/", 8) == 0)
{
if (first_dir_separator(filename + 8) == NULL)
filename += 8;
}
/* Expand the possibly-abbreviated filename to an exact path name */
fullname = expand_dynamic_library_name(filename);