pg_controldata: Fix possible errors on corrupted pg_control
Protect against malformed timestamps. Also protect against negative WalSegSz
as it triggers division by zero:
((0x100000000UL) / (WalSegSz)) can turn into zero in
XLogFileName(xlogfilename, ControlFile->checkPointCopy.ThisTimeLineID,
segno, WalSegSz);
because if WalSegSz is -1 then by arithmetic rules in C we get
0x100000000UL / 0xFFFFFFFFFFFFFFFFUL == 0.
Author: Ilyasov Ian <ianilyasov@outlook.com>
Author: Anton Voloshin <a.voloshin@postgrespro.ru>
Backpatch-through: 13
Branch
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REL_15_STABLE
Details
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https://git.postgresql.org/pg/commitdiff/f1e0b078b2e3613d28dc10090d35cc3908bbbd09
Modified Files
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src/bin/pg_controldata/pg_controldata.c | 25 ++++++++++++++++++-------
1 file changed, 18 insertions(+), 7 deletions(-)
