Fix integer overflow in gdImageWebpCtx #296
Merged
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Integer overflow can be happened in expression
gdImageSX(im) * 4 * gdImageSY(im)
. It could lead to heap buffer overflow in the following code.This issue has been reported to the PHP Bug Tracking System. The proof-of-concept file will be supplied some days later.
This issue was discovered by Ke Liu of Tencent's Xuanwu LAB.