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authorDan Carpenter <dan.carpenter@oracle.com>2018-07-11 15:29:31 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-09-26 08:35:10 +0200
commit24328b80de178d4ece8175481349ae33ba3ca65f (patch)
tree7643e2b774e00da5aa47a86f3c1ee6cec6e1626b /drivers
parent8b97b2ec3672471fa2b0a6242001280b9854ad8a (diff)
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: <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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/misc/mei/bus-fixup.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/misc/mei/bus-fixup.c b/drivers/misc/mei/bus-fixup.c
index bdc7fcd80eca..9dcdc6f41ceb 100644
--- 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_cl *cl,
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;