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Bug #72828 superfluous NULL check in php_strtr_array
Submitted: 2016-08-13 11:45 UTC Modified: 2016-08-13 14:45 UTC
From: Assigned: cmb (profile)
Status: Not a bug Package: Strings related
PHP Version: 5.6Git-2016-08-13 (Git) OS: *
Private report: No CVE-ID: None
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 [2016-08-13 11:45 UTC]
In php_strtr_array_prepare_repls() `patterns` and `*allocs` are
allocated on the heap, but it is not checked whether that might
have failed, what can lead to OOB writes.

This may not be a problem with the Zend MM, but can be with other
memory managers.

If that also affects PHP 7 (where strtr() had be reimplemented),
has to be checked.


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 [2016-08-13 11:45 UTC]
-Assigned To: +Assigned To: cmb
 [2016-08-13 12:05 UTC]
Unless the allocations explicitly use the system allocator (i.e. do not use emalloc and variants), do NOT introduce NULL checks.
 [2016-08-13 13:39 UTC]
-Summary: php_strtr_array_prepare_repls does not check allocation results +Summary: superfluous NULL check in php_strtr_array
 [2016-08-13 13:39 UTC]
That has been further clarified on the internals mailing list[1].
So I'm changing the bug wrt. to the superfluous NULL check in

[1] <>
[2] <>
 [2016-08-13 14:45 UTC]
-Status: Assigned +Status: Not a bug
 [2016-08-13 14:45 UTC]
I've found that this issue indeed only affects PHP 5. After
reconsideration I think the NULL check is harmless – at least it
is not a bug.
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