>> The data structure element "arc4" was assigned a null pointer by the
>> mppe_alloc() function if a previous function call "crypto_alloc_blkcipher"
>> failed.
> 
> crypto_alloc_blkcipher() returns error pointers and not NULL.

That is true.


> This patch creates a bug.

Please explain: How?

Did you notice that the data structure element "arc4" was reset
to a null pointer if a failure was detected for the function
call "crypto_alloc_blkcipher"?

Do you find this specific assignment still necessary for exception
handling in the implementation of mppe_alloc() function?

Regards,
Markus
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