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mm, swap: fix memory leak in setup_clusters() error path

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Patch series "mm: swap: small fixes and comment cleanups", v2.

This series provides a few small fixes and cleanups for the swap code.

The first patch fixes a memory leak in an error path that was recently
introduced. The subsequent patches include minor logic adjustments and
the removal of redundant comments.


This patch (of 5):

setup_clusters() could leak 'cluster_info' memory if an error occurred on
a path that did not jump to the 'err_free' label.

This patch simplifies the error handling by removing the goto label and
instead calling free_cluster_info() on all error exit paths.

The new logic is safe, as free_cluster_info() already handles NULL pointer
inputs.

Link: https://lkml.kernel.org/r/20251031065011.40863-1-youngjun.park@lge.com
Link: https://lkml.kernel.org/r/20251031065011.40863-2-youngjun.park@lge.com
Fixes: 07adc4cf1ecd ("mm, swap: implement dynamic allocation of swap table")
Signed-off-by: Youngjun Park <youngjun.park@lge.com>
Reviewed-by: Kairui Song <kasong@tencent.com>
Reviewed-by: Baoquan He <bhe@redhat.com>
Cc: Barry Song <baohua@kernel.org>
Cc: Chris Li <chrisl@kernel.org>
Cc: Kemeng Shi <shikemeng@huaweicloud.com>
Cc: Nhat Pham <nphamcs@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Youngjun Park 2025-10-31 15:50:07 +09:00 committed by Andrew Morton
parent c230719523
commit cb65082a0a
1 changed files with 2 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
mm/swapfile.c
View File

@ -3330,7 +3330,7 @@ static struct swap_cluster_info *setup_clusters(struct swap_info_struct *si,
si->global_cluster = kmalloc(sizeof(*si->global_cluster),
GFP_KERNEL);
if (!si->global_cluster)
goto err_free;
goto err;
for (i = 0; i < SWAP_NR_ORDERS; i++)
si->global_cluster->next[i] = SWAP_ENTRY_INVALID;
spin_lock_init(&si->global_cluster_lock);
@ -3383,9 +3383,8 @@ static struct swap_cluster_info *setup_clusters(struct swap_info_struct *si,
}
return cluster_info;
err_free:
free_cluster_info(cluster_info, maxpages);
err:
free_cluster_info(cluster_info, maxpages);
return ERR_PTR(err);
}