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afs: Increase buffer size in afs_update_volume_status()

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[ 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@aladdin.ru>
Signed-off-by: David Howells <dhowells@redhat.com>
Link: https://lore.kernel.org/r/20240211150442.3416-1-d.dulov@aladdin.ru/ # v1
Link: https://lore.kernel.org/r/20240212083347.10742-1-d.dulov@aladdin.ru/ # v2
Link: https://lore.kernel.org/r/20240219143906.138346-3-dhowells@redhat.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Daniil Dulov 2024-02-19 14:39:03 +00:00 committed by Ksawlii
parent 15f5e32604
commit 450d760de8
1 changed files with 2 additions and 2 deletions
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4
fs/afs/volume.c
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@ -302,7 +302,7 @@ static int afs_update_volume_status(struct afs_volume *volume, struct key *key)
{ {
struct afs_server_list *new, *old, *discard; struct afs_server_list *new, *old, *discard;
struct afs_vldb_entry *vldb; struct afs_vldb_entry *vldb;
char idbuf[16]; char idbuf[24];
int ret, idsz; int ret, idsz;
_enter(""); _enter("");
@ -310,7 +310,7 @@ 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 /* We look up an ID by passing it as a decimal string in the
* operation's name parameter. * 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); vldb = afs_vl_lookup_vldb(volume->cell, key, idbuf, idsz);
if (IS_ERR(vldb)) { if (IS_ERR(vldb)) {