Fix GH-15980: Signed integer overflow in main/streams/streams.c

We need to avoid signed integer overflows which are undefined behavior.
We catch that, and set `offset` to `ZEND_LONG_MAX`

Fix GH-15980: Signed integer overflow in main/streams/streams.c

We need to avoid signed integer overflows which are undefined behavior.
We catch that, and set `offset` to `ZEND_LONG_MAX` (which is also the
largest value of `zend_off_t` on all platforms). Of course, that seek
may fail, but even if it succeeds, the stream is no longer readable,
but that matches the current behavior for offsets near `ZEND_LONG_MAX`.

Closes GH-15989.

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Revert "Fix GH-15980: Signed integer overflow in main/streams/streams.c"

This reverts commit 6a04c79e41bcdb8f8a62270b7d25f82698b9c5f0, since the
new test case apparently fails on 64bit L

Revert "Fix GH-15980: Signed integer overflow in main/streams/streams.c"

This reverts commit 6a04c79e41bcdb8f8a62270b7d25f82698b9c5f0, since the
new test case apparently fails on 64bit Linux, so this needs closer
investigation.

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Fix GH-15980: Signed integer overflow in main/streams/streams.c

We need to avoid signed integer overflows which are undefined behavior.
We catch that, and set `offset` to `ZEND_LONG_MAX`

Fix GH-15980: Signed integer overflow in main/streams/streams.c

We need to avoid signed integer overflows which are undefined behavior.
We catch that, and set `offset` to `ZEND_LONG_MAX` (which is also the
largest value of `zend_off_t` on all platforms). Of course, after such
a seek a stream is no longer readable, but that matches the current
behavior for offsets near `ZEND_LONG_MAX`.

Closes GH-15989.

show more ...