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11690db cleared stmt->executed on entry to execute() so a failed execute() could not leave the previous result fetchable. Drivers read that flag as "executed successfully at least once": pdo_oci reallocates its column buffers when it is clear, while PDO core skips describing the columns again because they are still set, so the OCI defines keep writing into the freed buffers; pdo_ibm leaks its column descriptors. Record the failed execute() in a separate bit instead. The cursor closer still runs on entry, but drivers without one are no longer drained, which also made them fetch every remaining row on each re-execute. Fixes phpGH-24372
ndossche
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Oct 17, 2026
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Okay, but I think the name of the new field could be better, it actually means "no successful completion since last attempted execution"
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11690db clears
stmt->executedon re-execute. pdo_oci reads that as a first execution and reallocates its column buffers while PDO core keeps the old descriptions, so the second fetch crashes; pdo_ibm leaks instead. A failed execute() is now tracked in a separate bit andexecutedis left alone. closeCursor() followed by execute() crashes pdo_oci the same way on every version; that needs a pdo_oci fix (php/pecl-database-pdo_oci#46).This is a much more simplified approach, personally I think this is much cleaner than the original
Fixes #24372