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HTTP: uniform checks in ngx_http_alloc_large_header_buffer(). If URI is not fully parsed yet, some pointers are not set. As a result, the calculation of "new + (ptr - old)" expression is flawed. According to C11, 6.5.6 Additive operators, p.9: : When two pointers are subtracted, both shall point to elements : of the same array object, or one past the last element of the : array object Since "ptr" is not set, subtraction leads to undefined behaviour, because "ptr" and "old" are not in the same buffer (i.e. array objects). Prodded by GCC undefined behaviour sanitizer.
author Vladimir Khomutov <vl@wbsrv.ru>
date Wed, 29 Nov 2023 11:13:05 +0300
parents e70cd097490a
children 4a3aa287704f
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/* 
 * Copyright (C) 2002-2021 Igor Sysoev
 * Copyright (C) 2011-2023 Nginx, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
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 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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 */