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Check for null bytes in filenames in 'expand-file-name' (bug#49723)

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* src/fileio.c (expand-file-name): Check for null bytes for both
NAME and DEFAULT-DIRECTORY arguments.  Also check for null bytes
in buffer-local default-directory, assuming it is used.
* src/coding.c (encode_file_name): Use CHECK_STRING_NULL_BYTES.
* src/lisp.h (CHECK_STRING_NULL_BYTES): Add function for checking
for null bytes in Lisp strings.
* test/src/fileio-tests.el (fileio-test--expand-file-name-null-bytes):
Add test for new changes to expand-file-name.
* etc/NEWS: Announce changes.
This commit is contained in:
Federico Tedin 2021-09-15 00:15:16 +02:00 • committed by Eli Zaretskii
parent 62e870691d
commit 4e21c5f451
5 changed files with 29 additions and 3 deletions
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3
src/coding.c
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@ -10430,8 +10430,7 @@ encode_file_name (Lisp_Object fname)
cause subtle bugs because the system would silently use a
different filename than expected. Perform this check after
encoding to not miss NUL bytes introduced through encoding. */
CHECK_TYPE (memchr (SSDATA (encoded), '\0', SBYTES (encoded)) == NULL,
Qfilenamep, fname);
CHECK_STRING_NULL_BYTES (encoded);
return encoded;
}