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[ Upstream commit 92c556ed6318e13c16746495a8d4513129eb9b0f ]
As Roman Smirnov reported as below:
"
There is a possible bug in f2fs_truncate_inode_blocks():
if (err < 0 && err != -ENOENT)
goto fail;
...
offset[1] = 0;
offset[0]++;
nofs += err;
If err = -ENOENT then nofs will sum with an error code,
which is strange behaviour. Also if nofs < ENOENT this will
cause an overflow. err will be equal to -ENOENT with the
following call stack:
truncate_nodes()
f2fs_get_node_page()
__get_node_page()
read_node_page()
"
If nat is corrupted, truncate_nodes() may return -ENOENT, and
f2fs_truncate_inode_blocks() doesn't handle such error correctly,
fix it.
Reported-by: Roman Smirnov <r.smirnov@omp.ru>
Closes: https://lore.kernel.org/linux-f2fs-devel/085b27fd2b364a3c8c3a9ca77363e246@omp.ru
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
9341e64966