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no check for a failled malloc
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Thanks for the report.

The first bullet is not possible because of [this line][1] that forces
p->pSrc to be NULL if pSub is NULL.  Similarly the second bullet is not
possible because the test of db->mallocFailed down inside of
sqlite3DbMallocRawNN() causes pEq to be NULL if pE2 is NULL.

[1]:  src:/file?ln=602&ci=8c4b1482eeb31856&name=src%2Fmalloc.c

So, neither of these cases are actual problems.  No action required.