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Mp4: introduced custom version of ngx_atofp().

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This allows to correctly parse "start" and "end" arguments without
null-termination (ticket #475), and also fixes rounding errors observed
with strtod() when using i387 instructions.
This commit is contained in:
Maxim Dounin 2016-10-27 17:57:16 +03:00
parent 9ea918a41d
commit 271d306056
1 changed files with 60 additions and 14 deletions
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74
src/http/modules/ngx_http_mp4_module.c
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@ -216,6 +216,7 @@ typedef struct {
static ngx_int_t ngx_http_mp4_handler(ngx_http_request_t *r);
static ngx_int_t ngx_http_mp4_atofp(u_char *line, size_t n, size_t point);
static ngx_int_t ngx_http_mp4_process(ngx_http_mp4_file_t *mp4);
static ngx_int_t ngx_http_mp4_read_atom(ngx_http_mp4_file_t *mp4,
@ -537,26 +538,15 @@ ngx_http_mp4_handler(ngx_http_request_t *r)
/*
* A Flash player may send start value with a lot of digits
* after dot so strtod() is used instead of atofp(). NaNs and
* infinities become negative numbers after (int) conversion.
* after dot so a custom function is used instead of ngx_atofp().
*/
ngx_set_errno(0);
start = (int) (strtod((char *) value.data, NULL) * 1000);
if (ngx_errno != 0) {
start = -1;
}
start = ngx_http_mp4_atofp(value.data, value.len, 3);
}
if (ngx_http_arg(r, (u_char *) "end", 3, &value) == NGX_OK) {
ngx_set_errno(0);
end = (int) (strtod((char *) value.data, NULL) * 1000);
if (ngx_errno != 0) {
end = -1;
}
end = ngx_http_mp4_atofp(value.data, value.len, 3);
if (end > 0) {
if (start < 0) {
@ -686,6 +676,62 @@ ngx_http_mp4_handler(ngx_http_request_t *r)
}
static ngx_int_t
ngx_http_mp4_atofp(u_char *line, size_t n, size_t point)
{
ngx_int_t value, cutoff, cutlim;
ngx_uint_t dot;
/* same as ngx_atofp(), but allows additional digits */
if (n == 0) {
return NGX_ERROR;
}
cutoff = NGX_MAX_INT_T_VALUE / 10;
cutlim = NGX_MAX_INT_T_VALUE % 10;
dot = 0;
for (value = 0; n--; line++) {
if (*line == '.') {
if (dot) {
return NGX_ERROR;
}
dot = 1;
continue;
}
if (*line < '0' || *line > '9') {
return NGX_ERROR;
}
if (point == 0) {
continue;
}
if (value >= cutoff && (value > cutoff || *line - '0' > cutlim)) {
return NGX_ERROR;
}
value = value * 10 + (*line - '0');
point -= dot;
}
while (point--) {
if (value > cutoff) {
return NGX_ERROR;
}
value = value * 10;
}
return value;
}
static ngx_int_t
ngx_http_mp4_process(ngx_http_mp4_file_t *mp4)
{