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Sanity check the return from the kernel.

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We should be getting back as many bytes as we asked for, and we
don't handle shortages at all, so just reject anything that's
not right.

Differential Revision: https://reviews.freebsd.org/D15629
This commit is contained in:
Warner Losh 2018-05-31 02:57:51 +00:00
parent 3dfe152d8d
commit 92376fa76c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=334413
1 changed files with 5 additions and 0 deletions
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5
lib/libdevinfo/devinfo.c
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@ -220,6 +220,11 @@ devinfo_init_devices(int generation)
warn("sysctl hw.bus.devices.%d", dev_idx);
return(errno);
}
if (rlen != sizeof(udev)) {
warnx("sysctl returned wrong data %zd bytes instead of %zd",
rlen, sizeof(udev));
return (EINVAL);
}
if ((dd = malloc(sizeof(*dd))) == NULL)
return(ENOMEM);
dd->dd_dev.dd_handle = udev.dv_handle;