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btrfs: prop: fix zstd compression parameter validation
commit50398fde99
upstream. We let pass zstd compression parameter even if it is not fully valid. For example: $ btrfs prop set /btrfs compression zst $ btrfs prop get /btrfs compression compression=zst zlib and lzo are fine. Fix it by checking the correct prefix length. Fixes:5c1aab1dd5
("btrfs: Add zstd support") CC: stable@vger.kernel.org # 4.14+ Reviewed-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: Anand Jain <anand.jain@oracle.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -416,7 +416,7 @@ static int prop_compression_apply(struct inode *inode,
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btrfs_set_fs_incompat(fs_info, COMPRESS_LZO);
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} else if (!strncmp("zlib", value, 4)) {
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type = BTRFS_COMPRESS_ZLIB;
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} else if (!strncmp("zstd", value, len)) {
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} else if (!strncmp("zstd", value, 4)) {
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type = BTRFS_COMPRESS_ZSTD;
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btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD);
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} else {
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