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jfs: fix metapage reference count leak in dbAllocCtl

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[ Upstream commit 856db37592021e9155384094e331e2d4589f28b1 ]

In dbAllocCtl(), read_metapage() increases the reference count of the
metapage. However, when dp->tree.budmin < 0, the function returns -EIO
without calling release_metapage() to decrease the reference count,
leading to a memory leak.

Add release_metapage(mp) before the error return to properly manage
the metapage reference count and prevent the leak.

Fixes: a5f5e4698f8abbb25fe4959814093fb5bfa1aa9d ("jfs: fix shift-out-of-bounds in dbSplit")

Signed-off-by: Zheng Yu <zheng.yu@northwestern.edu>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Zheng Yu 2025-07-29 01:22:14 +00:00 • committed by Greg Kroah-Hartman
commit 9b38fb31c2
1 changed files with 3 additions and 1 deletions
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4
fs/jfs/jfs_dmap.c
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@ -1875,8 +1875,10 @@ dbAllocCtl(struct bmap * bmp, s64 nblocks, int l2nb, s64 blkno, s64 * results)
return -EIO;
dp = (struct dmap *) mp->data;
if (dp->tree.budmin < 0)
if (dp->tree.budmin < 0) {
release_metapage(mp);
return -EIO;
}
/* try to allocate the blocks.
*/