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MDEV-4252 geometry query crashes server.

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The bug was found by Alyssa Milburn.
      If the number of points of a geometry feature read from
      binary representation is greater than 0x10000000, then
      the (uint32) (num_points * 16) will cut the higher byte,
      which leads to various errors.
      Fixed by additional check if (num_points > max_n_points).
This commit is contained in:
Alexey Botchkov
2013-03-10 23:08:05 +04:00
parent 027e34e13b
commit 511b943263
4 changed files with 27 additions and 13 deletions
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27
sql/spatial.cc
View File

@ -556,7 +556,7 @@ bool Gis_line_string::get_data_as_wkt(String *txt, const char **end) const
n_points= uint4korr(data);
data += 4;
if (n_points < 1 ||
if (n_points < 1 || n_points > max_n_points ||
no_data(data, SIZEOF_STORED_DOUBLE * 2 * n_points) ||
txt->reserve(((MAX_DIGITS_IN_DOUBLE + 1)*2 + 1) * n_points))
return 1;
@ -594,7 +594,8 @@ int Gis_line_string::geom_length(double *len) const
return 1;
n_points= uint4korr(data);
data+= 4;
if (n_points < 1 || no_data(data, SIZEOF_STORED_DOUBLE * 2 * n_points))
if (n_points < 1 || n_points > max_n_points ||
no_data(data, SIZEOF_STORED_DOUBLE * 2 * n_points))
return 1;
get_point(&prev_x, &prev_y, data);
@ -628,7 +629,7 @@ int Gis_line_string::is_closed(int *closed) const
return 0;
}
data+= 4;
if (n_points == 0 ||
if (n_points == 0 || n_points > max_n_points ||
no_data(data, SIZEOF_STORED_DOUBLE * 2 * n_points))
return 1;
@ -798,7 +799,8 @@ bool Gis_polygon::get_data_as_wkt(String *txt, const char **end) const
return 1;
n_points= uint4korr(data);
data+= 4;
if (no_data(data, (SIZEOF_STORED_DOUBLE*2) * n_points) ||
if (n_points > max_n_points ||
no_data(data, (SIZEOF_STORED_DOUBLE*2) * n_points) ||
txt->reserve(2 + ((MAX_DIGITS_IN_DOUBLE + 1) * 2 + 1) * n_points))
return 1;
txt->qs_append('(');
@ -852,7 +854,8 @@ int Gis_polygon::area(double *ar, const char **end_of_data) const
if (no_data(data, 4))
return 1;
n_points= uint4korr(data);
if (no_data(data, (SIZEOF_STORED_DOUBLE*2) * n_points))
if (n_points > max_n_points ||
no_data(data, (SIZEOF_STORED_DOUBLE*2) * n_points))
return 1;
get_point(&prev_x, &prev_y, data+4);
data+= (4+SIZEOF_STORED_DOUBLE*2);
@ -888,7 +891,8 @@ int Gis_polygon::exterior_ring(String *result) const
n_points= uint4korr(data);
data+= 4;
length= n_points * POINT_DATA_SIZE;
if (no_data(data, length) || result->reserve(1+4+4+ length))
if (n_points > max_n_points ||
no_data(data, length) || result->reserve(1+4+4+ length))
return 1;
result->q_append((char) wkb_ndr);
@ -973,7 +977,8 @@ int Gis_polygon::centroid_xy(double *x, double *y) const
return 1;
org_n_points= n_points= uint4korr(data);
data+= 4;
if (no_data(data, (SIZEOF_STORED_DOUBLE*2) * n_points))
if (n_points > max_n_points ||
no_data(data, (SIZEOF_STORED_DOUBLE*2) * n_points))
return 1;
get_point(&prev_x, &prev_y, data);
data+= (SIZEOF_STORED_DOUBLE*2);
@ -1260,7 +1265,8 @@ bool Gis_multi_line_string::get_data_as_wkt(String *txt,
return 1;
n_points= uint4korr(data + WKB_HEADER_SIZE);
data+= WKB_HEADER_SIZE + 4;
if (no_data(data, n_points * (SIZEOF_STORED_DOUBLE*2)) ||
if (n_points > max_n_points ||
no_data(data, n_points * (SIZEOF_STORED_DOUBLE*2)) ||
txt->reserve(2 + ((MAX_DIGITS_IN_DOUBLE + 1) * 2 + 1) * n_points))
return 1;
txt->qs_append('(');
@ -1521,7 +1527,8 @@ bool Gis_multi_polygon::get_data_as_wkt(String *txt, const char **end) const
return 1;
uint32 n_points= uint4korr(data);
data+= 4;
if (no_data(data, (SIZEOF_STORED_DOUBLE * 2) * n_points) ||
if (n_points > max_n_points ||
no_data(data, (SIZEOF_STORED_DOUBLE * 2) * n_points) ||
txt->reserve(2 + ((MAX_DIGITS_IN_DOUBLE + 1) * 2 + 1) * n_points,
512))
return 1;
@ -1604,6 +1611,8 @@ int Gis_multi_polygon::geometry_n(uint32 num, String *result) const
if (no_data(data, 4))
return 1;
n_points= uint4korr(data);
if (n_points > max_n_points)
return 1;
data+= 4 + POINT_DATA_SIZE * n_points;
}
} while (--num);