Mercurial > hg > nginx
diff src/core/ngx_parse.c @ 6009:15a15f6ae3a2
Core: overflow detection in number parsing functions.
author | Ruslan Ermilov <ru@nginx.com> |
---|---|
date | Tue, 17 Mar 2015 00:26:15 +0300 |
parents | d620f497c50f |
children | 040e2736e8dc |
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--- a/src/core/ngx_parse.c Tue Mar 17 00:24:34 2015 +0300 +++ b/src/core/ngx_parse.c Tue Mar 17 00:26:15 2015 +0300 @@ -12,10 +12,9 @@ ssize_t ngx_parse_size(ngx_str_t *line) { - u_char unit; - size_t len; - ssize_t size; - ngx_int_t scale; + u_char unit; + size_t len; + ssize_t size, scale, max; len = line->len; unit = line->data[len - 1]; @@ -24,21 +23,24 @@ case 'K': case 'k': len--; + max = NGX_MAX_SIZE_T_VALUE / 1024; scale = 1024; break; case 'M': case 'm': len--; + max = NGX_MAX_SIZE_T_VALUE / (1024 * 1024); scale = 1024 * 1024; break; default: + max = NGX_MAX_SIZE_T_VALUE; scale = 1; } size = ngx_atosz(line->data, len); - if (size == NGX_ERROR) { + if (size == NGX_ERROR || size > max) { return NGX_ERROR; } @@ -51,10 +53,9 @@ off_t ngx_parse_offset(ngx_str_t *line) { - u_char unit; - off_t offset; - size_t len; - ngx_int_t scale; + u_char unit; + off_t offset, scale, max; + size_t len; len = line->len; unit = line->data[len - 1]; @@ -63,27 +64,31 @@ case 'K': case 'k': len--; + max = NGX_MAX_OFF_T_VALUE / 1024; scale = 1024; break; case 'M': case 'm': len--; + max = NGX_MAX_OFF_T_VALUE / (1024 * 1024); scale = 1024 * 1024; break; case 'G': case 'g': len--; + max = NGX_MAX_OFF_T_VALUE / (1024 * 1024 * 1024); scale = 1024 * 1024 * 1024; break; default: + max = NGX_MAX_OFF_T_VALUE; scale = 1; } offset = ngx_atoof(line->data, len); - if (offset == NGX_ERROR) { + if (offset == NGX_ERROR || offset > max) { return NGX_ERROR; }