Fix GH-17746: Signed integer overflow when setting ATTR_TIMEOUT #17854
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`::setAttribute(PDO::ATTR_TIMEOUT, …)` accepts a timeout in seconds, but `sqlite3_busy_timeout()`[1] expects the timeout in milliseconds, which is an `int`. To avoid signed overflow, we reject values larger than the allowed range. We also cater to negative values by simply clamping those to zero, since `sqlite3_busy_timeout()` handles negative values the same as zero. [1] <https://www.sqlite.org/c3ref/busy_timeout.html>
nielsdos
approved these changes
Feb 18, 2025
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::setAttribute(PDO::ATTR_TIMEOUT, …)accepts a timeout in seconds, butsqlite3_busy_timeout()[1] expects the timeout in milliseconds, which is anint. To avoid signed overflow, we reject values larger than the allowed range.We also cater to negative values by simply clamping those to zero, since
sqlite3_busy_timeout()handles negative values the same as zero.[1] https://www.sqlite.org/c3ref/busy_timeout.html
@nielsdos said:
I'm not sure about this, since that may raise an exception with
ERRMODE_EXCEPTION(and possibly even withERRMODE_WARNINGdue to a global error handler), and might break working code (not working as intended, but somehow working). Perhaps it's better to postpone that to the master branch.