[Webkit-unassigned] [Bug 254532] New: [CG] Building the dictionary of the async image decoding options is not thread safe
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Mon Mar 27 09:57:05 PDT 2023
https://bugs.webkit.org/show_bug.cgi?id=254532
Bug ID: 254532
Summary: [CG] Building the dictionary of the async image
decoding options is not thread safe
Product: WebKit
Version: WebKit Nightly Build
Hardware: Unspecified
OS: Unspecified
Status: NEW
Severity: Normal
Priority: P2
Component: Images
Assignee: webkit-unassigned at lists.webkit.org
Reporter: sabouhallawa at apple.com
CC: sabouhallawa at apple.com
imageSourceThumbnailOptions() is called to build the dictionary of the async image decoding options. It uses the static variable `options` which is initialized the first time this function is called. If this function is called from multiple threads at the same time, more than one thread can see that the static variable `options` is initialized and may initialize it then. Setting the variable from these threads are not be atomic. So we may be end up with invalid pointer for this static variable.
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