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Fix undefined behavior leading to crash with clang#1

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AMDmi3 wants to merge 2 commits into
petewarden:masterfrom
AMDmi3:ub
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Fix undefined behavior leading to crash with clang#1
AMDmi3 wants to merge 2 commits into
petewarden:masterfrom
AMDmi3:ub

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@AMDmi3

@AMDmi3 AMDmi3 commented Nov 1, 2014

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This code crashes with clang 3.4.1+, most likely due to arithmetics to null pointer, which is undefined behavior. I've fixed two apparent cases, there may be more.

PS. I'll be unavailable for 2 weeks, after that I'll try to find other cases.
PPS. FYI, there's bunch of other code fixes to catdoc in Debian, you'd probably like to review and merge them as well. Catdoc it still in high demand, and I really hope we can bring it back to shape.

This code crashes with clang 3.4.1+, most likely due to arithmetics
to null pointer, which is undefined behavior
@AMDmi3

AMDmi3 commented Nov 1, 2014

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PPPS. I've just realized you may not be catdoc author. Still, fixes are relevant.

@skierpage

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Victor Wagner's 0.95 release of catdoc from 2016 makes changes at the same code sites in the two functions find_file() and list_charsets() ; I have these fixes in my fork. @AMDmi3 , do you think the UB bugs are fixed?

@AMDmi3

AMDmi3 commented Jul 10, 2025

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I'm no longer interested in this project, sorry.

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2 participants