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| author | Paolo Bonzini <pbonzini@redhat.com> | 2021-04-22 02:39:48 -0400 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-04-22 13:19:01 -0400 |
| commit | fd49e8ee70b306a003323a17bbcc0633f322c135 (patch) | |
| tree | be0e5f131ee5afdbaa7a6b5fc76bb36baad8c067 /fs/iomap/swapfile.c | |
| parent | 238eca821cee90e91139da84ef4f38c74d7cf0d9 (diff) | |
| parent | 7aef27f0b2a8a58c28578d3e0caf3f27e1a1c39c (diff) | |
| download | linux-fd49e8ee70b306a003323a17bbcc0633f322c135.tar.bz2 | |
Merge branch 'kvm-sev-cgroup' into HEAD
Diffstat (limited to 'fs/iomap/swapfile.c')
| -rw-r--r-- | fs/iomap/swapfile.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/fs/iomap/swapfile.c b/fs/iomap/swapfile.c index a648dbf6991e..a5e478de1417 100644 --- a/fs/iomap/swapfile.c +++ b/fs/iomap/swapfile.c @@ -170,6 +170,16 @@ int iomap_swapfile_activate(struct swap_info_struct *sis, return ret; } + /* + * If this swapfile doesn't contain even a single page-aligned + * contiguous range of blocks, reject this useless swapfile to + * prevent confusion later on. + */ + if (isi.nr_pages == 0) { + pr_warn("swapon: Cannot find a single usable page in file.\n"); + return -EINVAL; + } + *pagespan = 1 + isi.highest_ppage - isi.lowest_ppage; sis->max = isi.nr_pages; sis->pages = isi.nr_pages - 1; |