https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105357
--- Comment #3 from vwebber <vwebber at msn dot com> --- Thank you for the comments. However, the data being overwritten is on the stack in a function which is called after the problematic scanf() etc are are run. I would suggest running up GDB and do a break on access of the overwritten lvalue. Regards, Victor Webber V&T: 408-221-8467 V: 805-924-1953 vweb...@msn.com -----Original Message----- From: pinskia at gcc dot gnu.org <gcc-bugzi...@gcc.gnu.org> Sent: Saturday, April 23, 2022 1:07 AM To: vweb...@msn.com Subject: [Bug c/105357] dereferenced ptr on param stack gets over written https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgcc.gnu.org%2Fbugzilla%2Fshow_bug.cgi%3Fid%3D105357&data=05%7C01%7C%7Cccc94c12b24440504a1d08da25003521%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637862980067506332%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=Xv3EJ%2FCciXIGx8Y9sxvqo1rw9mcvMISwNFnGD5Dbowk%3D&reserved=0 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Resolution|--- |INVALID Status|UNCONFIRMED |RESOLVED --- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- You need better error checking in your code. scanf can fail and scanf with %s without a size can definitely have a buffer overflow. You might be able to detect some of this with -fsanitize=address or by using valgrind. This is almost definitely not a bug in GCC. -- You are receiving this mail because: You reported the bug.
