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| author |   John Hubbard <jhubbard@nvidia.com> | 2018-08-23 09:16:58 +0300 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-12 09:14:24 +0200 |
| commit | c1a214ad82d7ac6f19fe48f90b13403b40ead9dc (patch) | |
| tree | e7ca8a8b888ac979e78ca50ce7bf1582acef3894 /drivers/misc | |
| parent | mei: ignore not found client in the enumeration (diff) | |
| download | linux-dev-c1a214ad82d7ac6f19fe48f90b13403b40ead9dc.tar.xz linux-dev-c1a214ad82d7ac6f19fe48f90b13403b40ead9dc.zip | |
mei: fix use-after-free in mei_cl_write
KASAN reports a use-after-free during startup, in mei_cl_write:
BUG: KASAN: use-after-free in mei_cl_write+0x601/0x870 [mei]
(drivers/misc/mei/client.c:1770)
This is caused by commit 98e70866aacb ("mei: add support for variable
length mei headers."), which changed the return value from len, to
buf->size. That ends up using a stale buf pointer, because blocking
call, the cb (callback) is deleted in me_cl_complete() function.
However, fortunately, len remains unchanged throughout the function
(and I don't see anything else that would require re-reading buf->size
either), so the fix is to simply revert the change, and return len, as
before.
Fixes: 98e70866aacb ("mei: add support for variable length mei headers.")
CC: Arnd Bergmann <arnd@arndb.de>
CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: John Hubbard <jhubbard@nvidia.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc')
| -rw-r--r-- | drivers/misc/mei/client.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c index 4ab6251d418e..ebdcf0b450e2 100644 --- a/drivers/misc/mei/client.c +++ b/drivers/misc/mei/client.c @@ -1767,7 +1767,7 @@ out: } } - rets = buf->size; + rets = len; err: cl_dbg(dev, cl, "rpm: autosuspend\n"); pm_runtime_mark_last_busy(dev->dev); |