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urlapi: fix handling of "file:///"

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When the path is exactly one byte, a single slash.

Extended test 1560 to verify.

Found by Codex Security

Closes #21070
This commit is contained in:
Daniel Stenberg 2026-03-23 09:19:45 +01:00
parent 0c475b5df7
commit e0be05cbab
No known key found for this signature in database
GPG key ID: 5CC908FDB71E12C2
2 changed files with 13 additions and 8 deletions
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17
lib/urlapi.c
View file

@ -1064,7 +1064,8 @@ static CURLUcode handle_query(CURLU *u, const char *query,
}
static CURLUcode handle_path(CURLU *u, const char *path,
size_t pathlen, unsigned int flags)
size_t pathlen, unsigned int flags,
bool is_file)
{
CURLUcode result;
if(pathlen && (flags & CURLU_URLENCODE)) {
@ -1077,11 +1078,8 @@ static CURLUcode handle_path(CURLU *u, const char *path,
path = u->path = curlx_dyn_ptr(&enc);
}
if(pathlen <= 1) {
/* there is no path left or the slash, unset */
path = NULL;
}
else {
if(pathlen >= (size_t)(1 + !is_file)) {
/* paths for file:// scheme can be one byte, others need to be two */
if(!u->path) {
u->path = curlx_memdup0(path, pathlen);
if(!u->path)
@ -1116,6 +1114,7 @@ static CURLUcode parseurl(const char *url, CURLU *u, unsigned int flags)
size_t urllen;
CURLUcode result = CURLUE_OK;
struct dynbuf host;
bool is_file = FALSE;
DEBUGASSERT(url);
@ -1130,8 +1129,10 @@ static CURLUcode parseurl(const char *url, CURLU *u, unsigned int flags)
CURLU_DEFAULT_SCHEME));
/* handle the file: scheme */
if(schemelen && !strcmp(schemebuf, "file"))
if(schemelen && !strcmp(schemebuf, "file")) {
is_file = TRUE;
result = parse_file(url, urllen, u, &host, &path, &pathlen);
}
else {
const char *hostp = NULL;
size_t hostlen;
@ -1180,7 +1181,7 @@ static CURLUcode parseurl(const char *url, CURLU *u, unsigned int flags)
}
if(!result)
/* the fragment and query parts are trimmed off from the path */
result = handle_path(u, path, pathlen, flags);
result = handle_path(u, path, pathlen, flags, is_file);
if(!result) {
u->host = curlx_dyn_ptr(&host);
return CURLUE_OK;

4
tests/libtest/lib1560.c
View file

@ -775,6 +775,10 @@ static const struct urltestcase get_url_list[] = {
{"file:///file.txt#moo", "file:///file.txt#moo", 0, 0, CURLUE_OK},
{"file:////file.txt", "file:////file.txt", 0, 0, CURLUE_OK},
{"file:///file.txt", "file:///file.txt", 0, 0, CURLUE_OK},
{"file:///", "file:///", 0, 0, CURLUE_OK},
{"file:///.", "file:///", 0, 0, CURLUE_OK},
{"file:///./", "file:///", 0, 0, CURLUE_OK},
{"file:///a", "file:///a", 0, 0, CURLUE_OK},
{"file:./", "file://", 0, 0, CURLUE_OK},
{"http://example.com/hello/../here",
"http://example.com/hello/../here",