Null dereference possible in WebView::canShowMIMEType

• Component: WebKit Misc.
• Status: RESOLVED FIXED

[Ada Chan]

This is a snippet from WebView::canShowMIMEType():

    *canShow = MIMETypeRegistry::isSupportedImageMIMEType(mimeTypeStr) ||
        MIMETypeRegistry::isSupportedNonImageMIMEType(mimeTypeStr) ||
        (m_page && m_page->pluginData()->supportsMimeType(mimeTypeStr)) ||
        shouldUseEmbeddedView(mimeTypeStr);

m_page->pluginData() can return null if plugins are disabled on the user's system and we'd crash in that case.  We should null check m_page->pluginData().

[Ada Chan]

<rdar://problem/8185379>

[Ada Chan]

Created attachment 65346 [details]
Patch

Null check return value of m_page->pluginData() before accessing it.

[Ada Chan]

Committed fix: r65952