Malloc returned values doesn't checked

[NoamRabi20]

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Expected behavior

Malloc return values should be verified, and in case of unsuccessful malloc, error should be propagate

Actual behavior

unsuccessful malloc will return null, and the following action will cause crash

Steps to reproduce the behavior

run on low memory system

###examples
db/c.cc (7 instances)
cache/lru.cache.cc (2 instances)

[gitlijian]

hi， @NoamRabi20 Is this the way to modify it? If possible, I will perform exception detection at each call to malloc.

[NoamRabi20]

yes, this is good approach, just need to make sure at each call how the code handle errors (return null in this specific case) it may be different between calls