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mei: bus: type promotion bug in mei_nfc_if_version()

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commit b40b3e9358 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: 582ab27a06 ("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>
This commit is contained in:
Dan Carpenter
2018-07-11 15:29:31 +03:00
committed by Greg Kroah-Hartman
parent 0eb82af7cd
commit 29068d2971
1 changed files with 1 additions and 1 deletions
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2
drivers/misc/mei/bus-fixup.c
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@ -267,7 +267,7 @@ static int mei_nfc_if_version(struct mei_cl *cl,
ret = 0; ret = 0;
bytes_recv = __mei_cl_recv(cl, (u8 *)reply, if_version_length, 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"); dev_err(bus->dev, "Could not read IF version\n");
ret = -EIO; ret = -EIO;
goto err; goto err;