Patch "afs: Increase buffer size in afs_update_volume_status()" has been added to the 5.15-stable tree

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

    afs: Increase buffer size in afs_update_volume_status()

to the 5.15-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:
     afs-increase-buffer-size-in-afs_update_volume_status.patch
and it can be found in the queue-5.15 subdirectory.

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



commit 289dc8c4d17570d678191812a465c608708dc15c
Author: Daniil Dulov <d.dulov@xxxxxxxxxx>
Date:   Mon Feb 19 14:39:03 2024 +0000

    afs: Increase buffer size in afs_update_volume_status()
    
    [ Upstream commit 6ea38e2aeb72349cad50e38899b0ba6fbcb2af3d ]
    
    The max length of volume->vid value is 20 characters.
    So increase idbuf[] size up to 24 to avoid overflow.
    
    Found by Linux Verification Center (linuxtesting.org) with SVACE.
    
    [DH: Actually, it's 20 + NUL, so increase it to 24 and use snprintf()]
    
    Fixes: d2ddc776a458 ("afs: Overhaul volume and server record caching and fileserver rotation")
    Signed-off-by: Daniil Dulov <d.dulov@xxxxxxxxxx>
    Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
    Link: https://lore.kernel.org/r/20240211150442.3416-1-d.dulov@xxxxxxxxxx/ # v1
    Link: https://lore.kernel.org/r/20240212083347.10742-1-d.dulov@xxxxxxxxxx/ # v2
    Link: https://lore.kernel.org/r/20240219143906.138346-3-dhowells@xxxxxxxxxx
    Signed-off-by: Christian Brauner <brauner@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/fs/afs/volume.c b/fs/afs/volume.c
index 137a970c19fb3..3d39ce5a23f22 100644
--- a/fs/afs/volume.c
+++ b/fs/afs/volume.c
@@ -327,7 +327,7 @@ static int afs_update_volume_status(struct afs_volume *volume, struct key *key)
 {
 	struct afs_server_list *new, *old, *discard;
 	struct afs_vldb_entry *vldb;
-	char idbuf[16];
+	char idbuf[24];
 	int ret, idsz;
 
 	_enter("");
@@ -335,7 +335,7 @@ static int afs_update_volume_status(struct afs_volume *volume, struct key *key)
 	/* We look up an ID by passing it as a decimal string in the
 	 * operation's name parameter.
 	 */
-	idsz = sprintf(idbuf, "%llu", volume->vid);
+	idsz = snprintf(idbuf, sizeof(idbuf), "%llu", volume->vid);
 
 	vldb = afs_vl_lookup_vldb(volume->cell, key, idbuf, idsz);
 	if (IS_ERR(vldb)) {




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