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Petr Pavlu 4cc7e2b77c module: Fix memory deallocation on error path in move_module()

[ Upstream commit ca3881f6fd ]

The function move_module() uses the variable t to track how many memory
types it has allocated and consequently how many should be freed if an
error occurs.

The variable is initially set to 0 and is updated when a call to
module_memory_alloc() fails. However, move_module() can fail for other
reasons as well, in which case t remains set to 0 and no memory is freed.

Fix the problem by initializing t to MOD_MEM_NUM_TYPES. Additionally, make
the deallocation loop more robust by not relying on the mod_mem_type_t enum
having a signed integer as its underlying type.

Fixes: c7ee8aebf6 ("module: add stop-grap sanity check on module memcpy()")
Signed-off-by: Petr Pavlu <petr.pavlu@suse.com>
Reviewed-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Daniel Gomez <da.gomez@samsung.com>
Link: https://lore.kernel.org/r/20250618122730.51324-2-petr.pavlu@suse.com
Signed-off-by: Daniel Gomez <da.gomez@samsung.com>
Message-ID: <20250618122730.51324-2-petr.pavlu@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2025-07-17 18:43:41 +02:00

debug_kmemleak.c

module: prepare to handle ROX allocations for text

2024-11-07 14:25:15 -08:00

decompress.c

module/decompress: use kvmalloc() consistently

2023-11-02 07:35:39 -10:00

dups.c

remove pointless includes of <linux/fdtable.h>

2024-10-07 13:34:41 -04:00

internal.h

module: Allow __module_address() to be called from RCU section.