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Prevent overflow for block number in buffile.c

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As coded, the start block calculated by BufFileAppend() would overflow
once more than 16k files are used with a default block size.  This issue
existed before b1e5c9fa9a, but there's no reason not to be clean about
it.

Per report from Coverity, with a fix suggested by Tom Lane.
This commit is contained in:
Michael Paquier
2023-11-20 09:14:53 +09:00
parent 28f84f72fb
commit 3650e7a393
1 changed files with 1 additions and 1 deletions
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src/backend/storage/file/buffile.c
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@@ -904,7 +904,7 @@ BufFileSize(BufFile *file)
int64 int64
BufFileAppend(BufFile *target, BufFile *source) BufFileAppend(BufFile *target, BufFile *source)
{ {
int64 startBlock = target->numFiles * BUFFILE_SEG_SIZE; int64 startBlock = (int64) target->numFiles * BUFFILE_SEG_SIZE;
int newNumFiles = target->numFiles + source->numFiles; int newNumFiles = target->numFiles + source->numFiles;
int i; int i;