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aio_md_test: NUL-terminate result of readlink

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readlink does not NUL-terminate the output buffer.  This led to spurious
failures to destroy the md device because the unit number was garbage.
NUL-terminate the output buffer.

Reported by:	ASLR
MFC after:	1 week
Sponsored by:	Dell EMC Isilon

(cherry picked from commit ea0e1b19f2)
This commit is contained in:
Eric van Gyzen 2021-07-23 08:49:55 -05:00
parent 77f0c44e49
commit ac20fa249f
1 changed files with 2 additions and 1 deletions
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3
tests/sys/aio/aio_test.c
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@ -767,8 +767,9 @@ aio_md_cleanup(void)
strerror(errno));
return;
}
n = readlink(MDUNIT_LINK, buf, sizeof(buf));
n = readlink(MDUNIT_LINK, buf, sizeof(buf) - 1);
if (n > 0) {
buf[n] = '\0';
if (sscanf(buf, "%d", &unit) == 1 && unit >= 0) {
bzero(&mdio, sizeof(mdio));
mdio.md_version = MDIOVERSION;