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From: Szabolcs Nagy <nsz@sourceware.org> To: glibc-cvs@sourceware.org Subject: [glibc/arm/morello/main] Fix invalid pointer dereference in wcscpy_chk Date: Thu, 27 Oct 2022 13:48:53 +0000 (GMT) [thread overview] Message-ID: <20221027134854.A1097385151D@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=36cb53c9c848cba09e609f136689943e445d6d36 commit 36cb53c9c848cba09e609f136689943e445d6d36 Author: Szabolcs Nagy <szabolcs.nagy@arm.com> Date: Tue Jun 21 14:43:30 2022 +0100 Fix invalid pointer dereference in wcscpy_chk The src pointer is const and points to a different object, so accessing dest via src is invalid. Diff: --- debug/wcscpy_chk.c | 34 +++++++--------------------------- 1 file changed, 7 insertions(+), 27 deletions(-) diff --git a/debug/wcscpy_chk.c b/debug/wcscpy_chk.c index 8ef03f81e4..d2dc769181 100644 --- a/debug/wcscpy_chk.c +++ b/debug/wcscpy_chk.c @@ -24,36 +24,16 @@ wchar_t * __wcscpy_chk (wchar_t *dest, const wchar_t *src, size_t n) { wint_t c; - wchar_t *wcp; + wchar_t *wcp = dest; - if (__alignof__ (wchar_t) >= sizeof (wchar_t)) + do { - const ptrdiff_t off = dest - src - 1; - - wcp = (wchar_t *) src; - - do - { - if (__glibc_unlikely (n-- == 0)) - __chk_fail (); - c = *wcp++; - wcp[off] = c; - } - while (c != L'\0'); - } - else - { - wcp = dest; - - do - { - if (__glibc_unlikely (n-- == 0)) - __chk_fail (); - c = *src++; - *wcp++ = c; - } - while (c != L'\0'); + if (__glibc_unlikely (n-- == 0)) + __chk_fail (); + c = *src++; + *wcp++ = c; } + while (c != L'\0'); return dest; }
next reply other threads:[~2022-10-27 13:48 UTC|newest] Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-10-27 13:48 Szabolcs Nagy [this message] 2022-11-23 14:38 Szabolcs Nagy
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