curcpu false positive?
Erik Cederstrand
erik at cederstrand.dk
Thu Oct 11 13:06:44 UTC 2012
Hello,
I'm looking at some Clang Static Analyzer reports in the kernel, and a lot of them point back to a null pointer dereference in __pcpu_type (sys/amd64/include/pcpu.h:102) which is defined as:
102 /*
103 * Evaluates to the type of the per-cpu variable name.
104 */
105 #define __pcpu_type(name) \
106 __typeof(((struct pcpu *)0)->name)
Which indeed looks like a NULL pointer dereference. Looking at the latest commit message there, I'm sure the code is correct, but I'm unsure why the null pointer is OK. I'd appreciate an explanation :-)
Thanks,
Erik
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