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Fix passing NULL pointer to printf as string. #522

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merged 1 commit into from
Jan 19, 2021

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CiaranWoodward
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@CiaranWoodward CiaranWoodward commented Jan 18, 2021

Doing this is undefined behaviour, and causes crashes with certain
compilers/C libraries. The LOG_ARG macro is defined to function as
printf.

This was causing issues when running wakaama with logs enabled.

I went through all of the LOG_ARG calls, and wrapped any string args
which could be NULL in a helper macro which swaps them for an empty
string.

Signed-off-by: Ciaran Woodward c.woodward@cascoda.com

Doing this is undefined behaviour, and causes crashes with certain
compilers/C libraries.

Signed-off-by: Ciaran Woodward <c.woodward@cascoda.com>
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@sbertin-telular sbertin-telular left a comment

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Thank you for this contribution. I like that it only adds the null pointer check when logging is enabled.

@sbernard31 sbernard31 merged commit 7dcb5a2 into eclipse-wakaama:master Jan 19, 2021
@CiaranWoodward CiaranWoodward deleted the cia-printf-null branch January 19, 2021 12:33
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3 participants