6.5-stable review patch. If anyone has any objections, please let me know.
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From: David Disseldorp ddiss@suse.de
[ Upstream commit d14e3e553e05cb763964c991fe6acb0a6a1c6f9c ]
The target_cmd_counter struct allocated via target_alloc_cmd_counter() is never freed, resulting in leaks across various transport types, e.g.:
unreferenced object 0xffff88801f920120 (size 96): comm "sh", pid 102, jiffies 4294892535 (age 713.412s) hex dump (first 32 bytes): 07 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 38 01 92 1f 80 88 ff ff ........8....... backtrace: [<00000000e58a6252>] kmalloc_trace+0x11/0x20 [<0000000043af4b2f>] target_alloc_cmd_counter+0x17/0x90 [target_core_mod] [<000000007da2dfa7>] target_setup_session+0x2d/0x140 [target_core_mod] [<0000000068feef86>] tcm_loop_tpg_nexus_store+0x19b/0x350 [tcm_loop] [<000000006a80e021>] configfs_write_iter+0xb1/0x120 [<00000000e9f4d860>] vfs_write+0x2e4/0x3c0 [<000000008143433b>] ksys_write+0x80/0xb0 [<00000000a7df29b2>] do_syscall_64+0x42/0x90 [<0000000053f45fb8>] entry_SYSCALL_64_after_hwframe+0x6e/0xd8
Free the structure alongside the corresponding iscsit_conn / se_sess parent.
Signed-off-by: David Disseldorp ddiss@suse.de Link: https://lore.kernel.org/r/20230831183459.6938-1-ddiss@suse.de Fixes: becd9be6069e ("scsi: target: Move sess cmd counter to new struct") Reviewed-by: Mike Christie michael.christie@oracle.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/target/target_core_transport.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index 687adc9e086ca..0686882bcbda3 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -264,6 +264,7 @@ void target_free_cmd_counter(struct target_cmd_counter *cmd_cnt) percpu_ref_put(&cmd_cnt->refcnt);
percpu_ref_exit(&cmd_cnt->refcnt); + kfree(cmd_cnt); } EXPORT_SYMBOL_GPL(target_free_cmd_counter);