Red Hat Bugzilla – Bug 991536
gnuplot-wx crash/corrupted input with piped input
Last modified: 2014-02-05 17:13:38 EST
Description of problem:
When used with piped input and -persist gnuplot will crash if the graph is zoomed (by right-click + drag + clicking on the graph window to select a zoom area).
Version-Release number of selected component (if applicable):
Spotted in gnuplot-4.6.1-4.fc18.x86_64, verified in upstream 4.6.1, once I'd already tracked down and fixed the problem myself I see that upstream 4.6.3 contains a fix.
Fedora bug for upgrade to upstream 4.6.3:
Upstream bug ref:
The upstream description is fairly complete so I won't go in-depth here, simply put EOF scribbles on the line buffer without resetting the parser state, so we at some point attempt to continue parse/execution in the middle of garbage input.
Steps to Reproduce:
Once the graph window is visible, right-click, drag out a zoom rectangle, then click (either button) again to zoom.
Compare the following cases:
gnuplot> plot x
echo "plot x" >/tmp/gnuplot-cmds
gnuplot-wx -persist /tmp/gnuplot-cmds
echo "plot x" | gnuplot-wx -persist
( echo "plot x" ; sleep 3600 ) | gnuplot-wx
In the first two zooming appears to work fine. The second two, under other systems we just get an error printed out and the process terminates (in this case it complains about substr() being given non-integer arguments, with a more complicated plot line it'll probably give some variety of other parse error).
Under Fedora it actually crashes with a stack-smash error.
Once I'd tracked down and fixed the cause of the syntax errors, it then became possible to compare with the latest upstream source and see that it is also fixed there. (Their fix is better.)
I note that 4.6.3 has been taken for fc20, but fc18 and fc19 are still at 4.6.1 - hopefully this crash counts as a push for bug 953407 going to fc18 and fc19 as well to pick up the upstream fix. (Or temporarily backport a fix if not.)
Note that the fix just avoids generating the parse error in this case (which is a real actual bug in itself.) The crash under Fedora is a separate unrelated gnuplot bug which I have raised bug 991534 for.
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