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authorSergei Rogachev <rogachevsergei@gmail.com>2016-08-11 22:09:30 +0300
committerVincent Sanders <vince@kyllikki.org>2016-08-14 22:37:12 +0100
commita815ad62502669e9a2b689f6f609eb03008a4ca4 (patch)
treefda802d620b8ace5598a99ac5276b6c03d503c54 /include
parentc95cca4ca6e806f1e2a3a829ce0dda655fdc886d (diff)
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Fix longjmp to invalid address on jpeg init error
Libjpeg used in NetSurf for decoding of JPEG images handles exceptions using a pair of non-local jump functions: setjmp() and longjmp(). When a decompression context is created via a call to the function jpeg_create_decompress() the caller passes a structure jpeg_decompress_struct as a parameter. This structure should has a validly initialized jump buffer, so the initialization or other functions called in future can jump to the exception handling context. The jpeg backend of NetSurf now initializes libjpeg mistakenly: jump buffer is filled after the call to jpeg_create_decompress(). It results in jump to random addresses in the case of exception caught during operation of the function jpeg_create_decompress(). The patch moves the initialization of jump buffer before the call to jpeg_create_decompress(). Signed-off-by: Sergei Rogachev <rogachevsergei@gmail.com>
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