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Fix "ignoring return value" complaints from commit 96d1f423f9

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The cfbot and some BF animals are complaining about the previous
read_binary_file commit because of ignoring return value of ‘fread’.
So let's make everyone happy by testing the return value even though
not strictly needed.

Reported by Justin Pryzby, and suggested patch by Tom Lane. Backpatched
to v11 same as the previous commit.

Reported-By: Justin Pryzby
Reviewed-By: Tom Lane
Discussion: https://postgr.es/m/flat/969b8d82-5bb2-5fa8-4eb1-f0e685c5d736%40joeconway.com
Backpatch-through: 11
This commit is contained in:
Joe Conway 2020-07-04 13:47:07 -04:00
parent 0025c3a2c2
commit c536da177c
1 changed files with 1 additions and 2 deletions
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3
src/backend/utils/adt/genfile.c
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@ -168,8 +168,7 @@ read_binary_file(const char *filename, int64 seek_offset, int64 bytes_to_read,
{
char rbuf[1];
fread(rbuf, 1, 1, file);
if (!feof(file))
if (fread(rbuf, 1, 1, file) != 0 || !feof(file))
ereport(ERROR,
(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
errmsg("file length too large")));