#1914: Possible infinite loop in v.in.dxf (present in 6.4.3RC2)
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Reporter: RikSaunderson | Owner: grass-dev@…
Type: defect | Status: new
Priority: minor | Milestone: 6.4.3
Component: Vector | Version: 6.4.3 RCs
Keywords: DXF, infiinte loop | Platform: All
Cpu: Unspecified |
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Hi there,
In the file dxf_to_vect.c, which is part of v.in.dxf, there is a potential
infinite loop. The code is as follows (lines 23-29, in function int
dxf_to_vect(struct dxf_file *dxf, struct Map_info *Map)):
while (code != 0)
{
if (code == -2) /* EOF */
return -1;
/* only looking for header groups (code == 9) */
if (code != 9)
continue;
...
//value of code is modified down here
}
This snippet is looking for the Id of a header section of a DXF file.
An Id of 9 denotes the header of the file, other Ids represent other
things.
If a corrupted DXF file is input, or a completely different type of file
which is not a DXF file but superficially looks like one, then this could
result in an infinite loop. If the value of code is, for example, 5 the
first time we enter this loop, then the loop will never terminate.
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Ticket URL: <http://trac.osgeo.org/grass/ticket/1914>
GRASS GIS <http://grass.osgeo.org>