Patch "fs: dlm: change allocation limits" has been added to the 5.12-stable tree

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

    fs: dlm: change allocation limits

to the 5.12-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:
     fs-dlm-change-allocation-limits.patch
and it can be found in the queue-5.12 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 8db6e06a1990cd91c6ed492c66893ed2b775070b
Author: Alexander Aring <aahringo@xxxxxxxxxx>
Date:   Mon Mar 1 17:05:14 2021 -0500

    fs: dlm: change allocation limits
    
    [ Upstream commit c45674fbdda138814ca21138475219c96fa5aa1f ]
    
    While running tcpkill I experienced invalid header length values while
    receiving to check that a node doesn't try to send a invalid dlm message
    we also check on applications minimum allocation limit. Also use
    DEFAULT_BUFFER_SIZE as maximum allocation limit. The define
    LOWCOMMS_MAX_TX_BUFFER_LEN is to calculate maximum buffer limits on
    application layer, future midcomms layer will subtract their needs from
    this define.
    
    Signed-off-by: Alexander Aring <aahringo@xxxxxxxxxx>
    Signed-off-by: David Teigland <teigland@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c
index 0f7fa23cccf0..f827d0b3962a 100644
--- a/fs/dlm/lowcomms.c
+++ b/fs/dlm/lowcomms.c
@@ -1375,9 +1375,11 @@ void *dlm_lowcomms_get_buffer(int nodeid, int len, gfp_t allocation, char **ppc)
 	struct writequeue_entry *e;
 	int offset = 0;
 
-	if (len > LOWCOMMS_MAX_TX_BUFFER_LEN) {
-		BUILD_BUG_ON(PAGE_SIZE < LOWCOMMS_MAX_TX_BUFFER_LEN);
+	if (len > DEFAULT_BUFFER_SIZE ||
+	    len < sizeof(struct dlm_header)) {
+		BUILD_BUG_ON(PAGE_SIZE < DEFAULT_BUFFER_SIZE);
 		log_print("failed to allocate a buffer of size %d", len);
+		WARN_ON(1);
 		return NULL;
 	}
 



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