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module/decompress: Never use kunmap() for local un-mappings 

[ Upstream commit 3c17655ab1 ]

Use kunmap_local() to unmap pages locally mapped with kmap_local_page().

kunmap_local() must be called on the kernel virtual address returned by
kmap_local_page(), differently from how we use kunmap() which instead
expects the mapped page as its argument.

In module_zstd_decompress() we currently map with kmap_local_page() and
unmap with kunmap(). This breaks the code and so it should be fixed.

Cc: Piotr Gorski <piotrgorski@cachyos.org>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: Stephen Boyd <swboyd@chromium.org>
Cc: Ira Weiny <ira.weiny@intel.com>
Fixes: 169a58ad82 ("module/decompress: Support zstd in-kernel decompression")
Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Piotr Gorski <piotrgorski@cachyos.org>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Fabio M. De Francesco 2023-03-15 13:52:56 +01:00 committed by Greg Kroah-Hartman
parent 05ded89b81
commit 14f8027da4
1 changed files with 1 additions and 1 deletions
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2
kernel/module/decompress.c
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@ -267,7 +267,7 @@ static ssize_t module_zstd_decompress(struct load_info *info,
zstd_dec.size = PAGE_SIZE;
ret = zstd_decompress_stream(dstream, &zstd_dec, &zstd_buf);
kunmap(page);
kunmap_local(zstd_dec.dst);
retval = zstd_get_error_code(ret);
if (retval)
break;