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pstore: fix potential logic issue in pstore read interface

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1) in the calling of erst_read, the parameter of buffer size
maybe overflows and cause crash

2) the return value of erst_read should be checked more strictly

Signed-off-by: Chen Gong <gong.chen@linux.intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Chen Gong 2011-05-16 11:01:39 -07:00 • committed by Tony Luck
parent 06cf91b4b4
commit f5ec25deb2
1 changed files with 8 additions and 1 deletions
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9
drivers/acpi/apei/erst.c
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@ -1006,7 +1006,14 @@ skip:
} }
len = erst_read(record_id, &rcd->hdr, sizeof(*rcd) + len = erst_read(record_id, &rcd->hdr, sizeof(*rcd) +
erst_erange.size); erst_info.bufsize);
/* The record may be cleared by others, try read next record */
if (len == -ENOENT)
goto skip;
else if (len < 0) {
rc = -1;
goto out;
}
if (uuid_le_cmp(rcd->hdr.creator_id, CPER_CREATOR_PSTORE) != 0) if (uuid_le_cmp(rcd->hdr.creator_id, CPER_CREATOR_PSTORE) != 0)
goto skip; goto skip;