| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 67/70] mei: bus: type promotion bug in mei_nfc_if_version() | Date | Mon, 24 Sep 2018 13:53:06 +0200 |
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4.4-stable review patch. If anyone has any objections, please let me know.
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From: Dan Carpenter <dan.carpenter@oracle.com>
commit b40b3e9358fbafff6a4ba0f4b9658f6617146f9c upstream.
We accidentally removed the check for negative returns without considering the issue of type promotion. The "if_version_length" variable is type size_t so if __mei_cl_recv() returns a negative then "bytes_recv" is type promoted to a high positive value and treated as success.
Cc: <stable@vger.kernel.org> Fixes: 582ab27a063a ("mei: bus: fix received data size check in NFC fixup") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/misc/mei/bus-fixup.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/misc/mei/bus-fixup.c +++ b/drivers/misc/mei/bus-fixup.c @@ -151,7 +151,7 @@ static int mei_nfc_if_version(struct mei ret = 0; bytes_recv = __mei_cl_recv(cl, (u8 *)reply, if_version_length); - if (bytes_recv < if_version_length) { + if (bytes_recv < 0 || bytes_recv < if_version_length) { dev_err(bus->dev, "Could not read IF version\n"); ret = -EIO; goto err;
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