X2Go Bug report logs - #777
nx-libs: incorrect usage of scanf

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Package: nx-libs; Maintainer for nx-libs is X2Go Developers <x2go-dev@lists.x2go.org>;

Reported by: Heinrich Schuchardt <xypron.glpk@gmx.de>

Date: Fri, 30 Jan 2015 19:40:01 UTC

Severity: normal

Found in version head

Done: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>

Bug is archived. No further changes may be made.

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package: nx-libs
version: head

In different parts of the nx-libs library you can find usages of scanf like

   /* check for MESA_GAMMA environment variable */
   gamma = _mesa_getenv("MESA_GAMMA");
   if (gamma) {
      v->RedGamma = v->GreenGamma = v->BlueGamma = 0.0;
      sscanf( gamma, "%f %f %f", &v->RedGamma, &v->GreenGamma,
&v->BlueGamma );

According to cppcheck:

scanf without field width limits can crash with huge input data on libc
versions older than 2.13-25. Add a field width specifier to fix this
problem:
    %i => %3i


Best regards

Heinrich Schuchardt

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