diff options
| author | Joshua Oreman <oremanj@rwcr.net> | 2010-01-26 23:55:23 -0500 |
|---|---|---|
| committer | Marty Connor <mdc@etherboot.org> | 2010-01-27 08:50:49 -0500 |
| commit | e6f08b0aa79a07bcadff203c91245db0dcd155b7 (patch) | |
| tree | 1511772d0d79bdd7b324d4e6ecdb941345d00436 /src | |
| parent | 329c7b78e3b0b4148c91fde910fb22b2fc0df7fe (diff) | |
| download | ipxe-e6f08b0aa79a07bcadff203c91245db0dcd155b7.zip ipxe-e6f08b0aa79a07bcadff203c91245db0dcd155b7.tar.gz ipxe-e6f08b0aa79a07bcadff203c91245db0dcd155b7.tar.bz2 | |
[uri] Handle an empty unparse_uri() result properly
Previously, if none of the URI parts requested existed in the passed
URI, unparse_uri() would not touch the destination buffer at all; this
could lead to use of uninitialized data. Fix by setting buf[0] = '\0'
before unparsing whenever we have room to do so.
Signed-off-by: Joshua Oreman <oremanj@rwcr.net>
Signed-off-by: Marty Connor <mdc@etherboot.org>
Diffstat (limited to 'src')
| -rw-r--r-- | src/core/uri.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/src/core/uri.c b/src/core/uri.c index 9666778..6a1f2e5 100644 --- a/src/core/uri.c +++ b/src/core/uri.c @@ -225,12 +225,13 @@ int unparse_uri ( char *buf, size_t size, struct uri *uri, dump_uri ( uri ); DBG ( "\n" ); + /* Ensure buffer is NUL-terminated */ + if ( size ) + buf[0] = '\0'; + /* Special-case NULL URI */ - if ( ! uri ) { - if ( size ) - buf[0] = '\0'; + if ( ! uri ) return 0; - } /* Iterate through requested fields */ for ( i = URI_FIRST_FIELD; i <= URI_LAST_FIELD; i++ ) { |