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Avoid crashes on MS-Windows due to invalid UNC file names

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* src/w32.c (parse_root): Avoid crashes due to invalid (too short)
UNC names, such as "\\".  (Bug#70914)

* test/src/fileio-tests.el (fileio-tests-invalid-UNC): New test.
This commit is contained in:
Eli Zaretskii 2024-05-22 14:10:53 +03:00
parent ccf8dba44a
commit 350ae75f5c
2 changed files with 7 additions and 1 deletions
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2
src/w32.c
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@ -2572,7 +2572,7 @@ parse_root (const char * name, const char ** pPath)
name += 2;
do
{
if (IS_DIRECTORY_SEP (*name) && --slashes == 0)
if (!*name || (IS_DIRECTORY_SEP (*name) && --slashes == 0))
break;
name++;
}

6
test/src/fileio-tests.el
View file

@ -218,4 +218,10 @@ Also check that an encoding error can appear in a symlink."
(should (equal (expand-file-name file nil) file))
(file-name-case-insensitive-p file)))
(ert-deftest fileio-tests-invalid-UNC ()
(skip-unless (eq system-type 'windows-nt))
;; These should not crash, see bug#70914.
(should-not (file-exists-p "//"))
(should (file-attributes "//")))
;;; fileio-tests.el ends here