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Ticket UUID:	d93d961dd4b5ee44e3c902366d52ea84d4c550b7
Title:	Pointer arithmetic with NULL in ImgGetPhoto()
Type:	Bug	Version:	core-8-6-branch
Submitter:	chrstphrchvz	Created on:	2025-08-02 09:40:36
Subsystem:	41. Photo Images	Assigned To:	chrstphrchvz
Priority:	5 Medium	Severity:	Minor
Status:	Closed	Last Modified:	2025-08-15 22:28:41
Resolution:	Fixed	Closed By:	jan.nijtmans
		Closed on:	2025-08-15 22:28:41
Description:	UBSan `-fsanitize=pointer-overflow` error observed for core-8-6-branch and later: % image create photo photo1 photo1 % photo1 data generic/tkImgPhoto.c:3798:24: runtime error: applying zero offset to null pointer …i.e. `blockPtr->pixelPtr` is `NULL`. (Split off from ticket [fef61fae66])
User Comments:	jan.nijtmans added on 2025-08-15 22:28:41: Fixed [61aaaad2d5fa6094\|here] (and in all other active branches) Thanks for the report! chrstphrchvz added on 2025-08-14 17:14:42: Jan, thanks for the proposed fix. I do not spot any issues with it.