From e873c74132f0c5f1452816cd9bb26208f0bba1e1 Mon Sep 17 00:00:00 2001 From: Shivank Garg Date: Sat, 22 Aug 2026 19:22:05 +0000 Subject: dmaengine: fix use-after-free in dma_chan_put() and dma_release_channel() When dma_device_put() drops the last reference on chan->device->ref, dma_device_release() runs and may free the dma_device along with its channels. dma_chan_put() then still reads chan->device->owner via dma_chan_to_owner() for the trailing module_put(). KASAN catches it: slab-use-after-free in dma_chan_put+0x3e6/0x4c0 Read of size 8 by task insmod/6319 Freed by task 6319: kfree+0x225/0x470 dma_chan_put+0x395/0x4c0 dmaengine_put+0xf8/0x160 Cache the module owner in dma_chan_put() before the put so the trailing module_put() does not need chan->device. Fixes: 8ad342a86359 ("dmaengine: Add reference counting to dma_device struct") Suggested-by: Sashiko Link: https://sashiko.dev/#/patchset/20260518-dmaengine-kref-fix-v1-1-4d6125048fb7@amd.com Reviewed-by: Frank Li Reviewed-by: Logan Gunthorpe Signed-off-by: Shivank Garg Link: https://patch.msgid.link/20260822-dmaengine-kref-fix-v5-3-d4a4ee47d927@amd.com Signed-off-by: Vinod Koul --- net/ceph/ceph_strings.c | 90 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 90 insertions(+) create mode 100644 net/ceph/ceph_strings.c (limited to 'net/ceph/ceph_strings.c') diff --git a/net/ceph/ceph_strings.c b/net/ceph/ceph_strings.c new file mode 100644 index 000000000..355fea272 --- /dev/null +++ b/net/ceph/ceph_strings.c @@ -0,0 +1,90 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Ceph string constants + */ +#include +#include + +const char *ceph_entity_type_name(int type) +{ + switch (type) { + case CEPH_ENTITY_TYPE_MDS: return "mds"; + case CEPH_ENTITY_TYPE_OSD: return "osd"; + case CEPH_ENTITY_TYPE_MON: return "mon"; + case CEPH_ENTITY_TYPE_CLIENT: return "client"; + case CEPH_ENTITY_TYPE_AUTH: return "auth"; + default: return "unknown"; + } +} +EXPORT_SYMBOL(ceph_entity_type_name); + +const char *ceph_auth_proto_name(int proto) +{ + switch (proto) { + case CEPH_AUTH_UNKNOWN: + return "unknown"; + case CEPH_AUTH_NONE: + return "none"; + case CEPH_AUTH_CEPHX: + return "cephx"; + default: + return "???"; + } +} + +const char *ceph_con_mode_name(int mode) +{ + switch (mode) { + case CEPH_CON_MODE_UNKNOWN: + return "unknown"; + case CEPH_CON_MODE_CRC: + return "crc"; + case CEPH_CON_MODE_SECURE: + return "secure"; + default: + return "???"; + } +} + +const char *ceph_osd_op_name(int op) +{ + switch (op) { +#define GENERATE_CASE(op, opcode, str) case CEPH_OSD_OP_##op: return (str); +__CEPH_FORALL_OSD_OPS(GENERATE_CASE) +#undef GENERATE_CASE + default: + return "???"; + } +} + +const char *ceph_osd_watch_op_name(int o) +{ + switch (o) { + case CEPH_OSD_WATCH_OP_UNWATCH: + return "unwatch"; + case CEPH_OSD_WATCH_OP_WATCH: + return "watch"; + case CEPH_OSD_WATCH_OP_RECONNECT: + return "reconnect"; + case CEPH_OSD_WATCH_OP_PING: + return "ping"; + default: + return "???"; + } +} + +const char *ceph_osd_state_name(int s) +{ + switch (s) { + case CEPH_OSD_EXISTS: + return "exists"; + case CEPH_OSD_UP: + return "up"; + case CEPH_OSD_AUTOOUT: + return "autoout"; + case CEPH_OSD_NEW: + return "new"; + default: + return "???"; + } +} -- cgit v1.3.1