From: Dan Carpenter Date: Wed, 11 Jul 2018 12:29:31 +0000 (+0300) Subject: mei: bus: type promotion bug in mei_nfc_if_version() X-Git-Tag: v4.14.72~14 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=29068d29718f0bdef2cb98e587e717496e81cbcc;p=platform%2Fkernel%2Flinux-rpi.git mei: bus: type promotion bug in mei_nfc_if_version() 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: Fixes: 582ab27a063a ("mei: bus: fix received data size check in NFC fixup") Signed-off-by: Dan Carpenter Signed-off-by: Tomas Winkler Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/misc/mei/bus-fixup.c b/drivers/misc/mei/bus-fixup.c index 0208c4b..fa0236a 100644 --- a/drivers/misc/mei/bus-fixup.c +++ b/drivers/misc/mei/bus-fixup.c @@ -267,7 +267,7 @@ static int mei_nfc_if_version(struct mei_cl *cl, ret = 0; bytes_recv = __mei_cl_recv(cl, (u8 *)reply, if_version_length, 0); - 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;