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authorChen Gong <gong.chen@linux.intel.com>2011-05-16 11:01:39 -0700
committerTony Luck <tony.luck@intel.com>2011-05-16 11:05:08 -0700
commitf5ec25deb2471bd49e907ab2f9ef6f860eb7cf95 (patch)
treec94504da49380911bef27f492e876ff19eb8a4b7 /drivers/acpi
parent06cf91b4b4aafa50ee0a94c81d2c6922a18af242 (diff)
pstore: fix potential logic issue in pstore read interface
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>
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/apei/erst.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/acpi/apei/erst.c b/drivers/acpi/apei/erst.c
index ddb68c4f8d3e..e6cef8e1b534 100644
--- a/drivers/acpi/apei/erst.c
+++ b/drivers/acpi/apei/erst.c
@@ -1006,7 +1006,14 @@ skip:
}
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)
goto skip;