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Fix off-by-one bug in LWLockRegisterTranche().

Original coding failed to enlarge the array as required ifthe requested tranche_id was equal to LWLockTranchesAllocated.In passing, fix poor style of not casting the result of (re)palloc.

1 parent49137ec commit4bfc5f1Copy full SHA for 4bfc5f1

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src/backend/storage/lmgr
- lwlock.c

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`‎src/backend/storage/lmgr/lwlock.c`

Lines changed: 7 additions & 5 deletions

Original file line number	Diff line number	Diff line change
`@@ -350,8 +350,9 @@ CreateLWLocks(void)`
`350`	`350`	`if (LWLockTrancheArray==NULL)`
`351`	`351`	`{`
`352`	`352`	`LWLockTranchesAllocated=16;`
`353`		`-LWLockTrancheArray=MemoryContextAlloc(TopMemoryContext,`
`354`		`-LWLockTranchesAllocatedsizeof(LWLockTranche));`
	`353`	`+LWLockTrancheArray= (LWLockTranche**)`
	`354`	`+MemoryContextAlloc(TopMemoryContext,`
	`355`	`+LWLockTranchesAllocatedsizeof(LWLockTranche));`
`355`	`356`	`}`
`356`	`357`
`357`	`358`	`MainLWLockTranche.name="main";`
`@@ -423,11 +424,12 @@ LWLockRegisterTranche(int tranche_id, LWLockTranche *tranche)`
`423`	`424`	`{`
`424`	`425`	`inti=LWLockTranchesAllocated;`
`425`	`426`
`426`		`-while (i<tranche_id)`
	`427`	`+while (i <=tranche_id)`
`427`	`428`	`i *=2;`
`428`	`429`
`429`		`-LWLockTrancheArray=repalloc(LWLockTrancheArray,`
`430`		`-isizeof(LWLockTranche));`
	`430`	`+LWLockTrancheArray= (LWLockTranche**)`
	`431`	`+repalloc(LWLockTrancheArray,`
	`432`	`+isizeof(LWLockTranche));`
`431`	`433`	`LWLockTranchesAllocated=i;`
`432`	`434`	`}`
`433`	`435`

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Commit4bfc5f1

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`‎src/backend/storage/lmgr/lwlock.c`

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