From 0ddc678927eaa127efc457535858c19e791a5339 Mon Sep 17 00:00:00 2001 From: Daniel Stenberg Date: Sun, 4 Aug 2013 23:27:27 +0200 Subject: formadd: wrong pointer for file name when CURLFORM_BUFFERPTR used The internal function that's used to detect known file extensions for the default Content-Type got the the wrong pointer passed in when CURLFORM_BUFFER + CURLFORM_BUFFERPTR were used. This had the effect that strlen() would be used which could lead to an out-of-bounds read (and thus segfault). In most cases it would only lead to it not finding or using the correct default content-type. It also showed that test 554 and test 587 were testing for the previous/wrong behavior and now they're updated as well. Bug: http://curl.haxx.se/bug/view.cgi?id=1262 Reported-by: Konstantin Isakov --- lib/formdata.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) (limited to 'lib') diff --git a/lib/formdata.c b/lib/formdata.c index 9d90f72e4..f718a3e4e 100644 --- a/lib/formdata.c +++ b/lib/formdata.c @@ -168,8 +168,8 @@ static FormInfo * AddFormInfo(char *value, * Returns some valid contenttype for filename. * ***************************************************************************/ -static const char * ContentTypeForFilename (const char *filename, - const char *prevtype) +static const char *ContentTypeForFilename(const char *filename, + const char *prevtype) { const char *contenttype = NULL; unsigned int i; @@ -178,7 +178,7 @@ static const char * ContentTypeForFilename (const char *filename, * extensions and pick the first we match! */ struct ContentType { - char extension[6]; + const char *extension; const char *type; }; static const struct ContentType ctts[]={ @@ -667,9 +667,11 @@ CURLFORMcode FormAdd(struct curl_httppost **httppost, if(((form->flags & HTTPPOST_FILENAME) || (form->flags & HTTPPOST_BUFFER)) && !form->contenttype ) { + char *f = form->flags & HTTPPOST_BUFFER? + form->showfilename : form->value; + /* our contenttype is missing */ - form->contenttype - = strdup(ContentTypeForFilename(form->value, prevtype)); + form->contenttype = strdup(ContentTypeForFilename(f, prevtype)); if(!form->contenttype) { return_value = CURL_FORMADD_MEMORY; break; -- cgit v1.2.3