linux

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Files

Miaoqian Lin 07ad45e06b s390/mm: Fix memory leak in add_marker() when kvrealloc() fails

The function has a memory leak when kvrealloc() fails.
The function directly assigns NULL to the markers pointer, losing the
reference to the previously allocated memory. This causes kvfree() in
pt_dump_init() to free NULL instead of the leaked memory.

Fix by:
1. Using kvrealloc() uniformly for all allocations
2. Using a temporary variable to preserve the original pointer until
   allocation succeeds
3. Removing the error path that sets markers_cnt=0 to keep
   consistency between markers and markers_cnt

Found via static analysis and this is similar to commit 42378a9ca5
("bpf, verifier: Fix memory leak in array reallocation for stack state")

Fixes: d0e7915d2a ("s390/mm/ptdump: Generate address marker array dynamically")
Cc: stable@vger.kernel.org
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

2025-10-29 14:17:50 +01:00

cmm.c

treewide: Switch/rename to timer_delete[_sync]()

2025-04-05 10:30:12 +02:00

dump_pagetables.c

s390/mm: Fix memory leak in add_marker() when kvrealloc() fails

2025-10-29 14:17:50 +01:00

extable.c

s390/uaccess: Shorten raw_copy_from_user() / raw_copy_to_user() inline assemblies

2025-03-04 17:18:03 +01:00

extmem.c

s390/extmem: Add workaround for DCSS unload diag