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commit    af3677ef1bc0c76069ff7dd00cd0339f26d372e9
Author:   Tom Lane <tgl@sss.pgh.pa.us>
Date:     Sun Aug 09 16:39:08 2020 +0000
First released in: 14.0, 9.5.23, 9.6.19, 10.14, 11.9, 12.4, 13.0

    Check for fseeko() failure in pg_dump's _tarAddFile().
    
    Coverity pointed out, not unreasonably, that we checked fseeko's
    result at every other call site but these.  Failure to seek in the
    temp file (note this is NOT pg_dump's output file) seems quite
    unlikely, and even if it did happen the file length cross-check
    further down would probably detect the problem.  Still, that's a
    poor excuse for not checking the result of a system call.


 src/bin/pg_dump/pg_backup_tar.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/bin/pg_dump/pg_backup_tar.c b/src/bin/pg_dump/pg_backup_tar.c
index 921918e3829..4cc9015ea51 100644
--- a/src/bin/pg_dump/pg_backup_tar.c
+++ b/src/bin/pg_dump/pg_backup_tar.c
@@ -1093,12 +1093,16 @@ _tarAddFile(ArchiveHandle *AH, TAR_MEMBER *th)
 	/*
 	 * Find file len & go back to start.
 	 */
-	fseeko(tmp, 0, SEEK_END);
+	if (fseeko(tmp, 0, SEEK_END) != 0)
+		exit_horribly(modulename, "error during file seek: %s\n",
+					  strerror(errno));
 	th->fileLen = ftello(tmp);
 	if (th->fileLen < 0)
 		exit_horribly(modulename, "could not determine seek position in archive file: %s\n",
 					  strerror(errno));
-	fseeko(tmp, 0, SEEK_SET);
+	if (fseeko(tmp, 0, SEEK_SET) != 0)
+		exit_horribly(modulename, "error during file seek: %s\n",
+					  strerror(errno));
 
 	_tarWriteHeader(th);
 


[parent: bc77fb7e47d4]