reassign 715855 libeb16
tags 715855 + patch
stop
The three bugs in libeb tools detected by "Mayhem" all have the same
cause: The function url_parts_parse() in eb/urlparts.c performs a
NULL-pointer dereference when trying to parse certain ill-formed ebook
URLs.
`hostport' is one of several local variables that url_parts_parse
initalises to NULL and then tries to match to particular parts of the
URL string. However, if the url string contains "//" and ends in "@",
the 'hostport' pointer is dereferenced even though it still has the
value NULL, which is causing the segfault.
You can reproduce the crash easily by running
$ ebfont "EBNET:// @"
(or passing a similar book URL to any of the other eb tools)
The following patch wraps the code that causes the NULL-pointer
dereference with a test that (hostport != NULL). The URL parsing code
in url_parts_parse() looks a little fragile though, there may be other
bugs.
I am reassigning the bug to libeb16, because url_parts_parse() is run
as a consequence of calling eb_bind(), which is part of the library
API.
Here is the patch:
--- a/eb/urlparts.c
+++ b/eb/urlparts.c
@@ -355,20 +355,22 @@ url_parts_parse(URL_Parts *parts, const char *url)
* Get host and port.
* IPv6 address is enclosed in `[' and `]'.
*/
- if (*hostport == '[') {
- right_bracket = strchr(hostport + 1, ']');
- if (right_bracket == NULL)
- separator = NULL;
- else {
- if (*(right_bracket + 1) == ':'
- || *(right_bracket + 1) == '\0') {
- hostport++;
- *right_bracket = '\0';
+ if (hostport != NULL) {
+ if (*hostport == '[') {
+ right_bracket = strchr(hostport + 1, ']');
+ if (right_bracket == NULL)
+ separator = NULL;
+ else {
+ if (*(right_bracket + 1) == ':'
+ || *(right_bracket + 1) == '\0') {
+ hostport++;
+ *right_bracket = '\0';
+ }
+ separator = strchr(right_bracket + 1, ':');
+ }
+ } else {
+ separator = strchr(hostport, ':');
}
- separator = strchr(right_bracket + 1, ':');
- }
- } else {
- separator = strchr(hostport, ':');
}
if (separator != NULL) {
--
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