[dm-devel] Patch "dm crypt: fix get_key_size compiler warning if !CONFIG_KEYS" has been added to the 4.19-stable tree

[Sasha Levin]

This is a note to let you know that I've just added the patch titled

    dm crypt: fix get_key_size compiler warning if !CONFIG_KEYS

to the 4.19-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     dm-crypt-fix-get_key_size-compiler-warning-if-config.patch
and it can be found in the queue-4.19 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable at vger.kernel.org> know about it.



commit 02da2fd27b2f8777698b06c781dd9aa7c3442730
Author: Aashish Sharma <shraash at google.com>
Date:   Fri Feb 11 12:15:38 2022 +0000

    dm crypt: fix get_key_size compiler warning if !CONFIG_KEYS
    
    [ Upstream commit 6fc51504388c1a1a53db8faafe9fff78fccc7c87 ]
    
    Explicitly convert unsigned int in the right of the conditional
    expression to int to match the left side operand and the return type,
    fixing the following compiler warning:
    
    drivers/md/dm-crypt.c:2593:43: warning: signed and unsigned
    type in conditional expression [-Wsign-compare]
    
    Fixes: c538f6ec9f56 ("dm crypt: add ability to use keys from the kernel key retention service")
    Signed-off-by: Aashish Sharma <shraash at google.com>
    Signed-off-by: Mike Snitzer <snitzer at redhat.com>
    Signed-off-by: Sasha Levin <sashal at kernel.org>

diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index a6a26f8e4d8e..3441ad140b58 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -2107,7 +2107,7 @@ static int crypt_set_keyring_key(struct crypt_config *cc, const char *key_string
 
 static int get_key_size(char **key_string)
 {
-	return (*key_string[0] == ':') ? -EINVAL : strlen(*key_string) >> 1;
+	return (*key_string[0] == ':') ? -EINVAL : (int)(strlen(*key_string) >> 1);
 }
 
 #endif