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| author | Yue Hu <huyue2@yulong.com> | 2019-02-01 11:27:32 +0800 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2019-02-12 12:38:54 -0800 |
| commit | 47afd7ae65c737bfef67e9eb1424723d13b06787 (patch) | |
| tree | 11a20edce466b8bbe77ecfc9fedd7bb19110dc85 | |
| parent | 1e0f67a96aedd0b5fbd3ae743e68a26606ea98e8 (diff) | |
| download | linux-47afd7ae65c737bfef67e9eb1424723d13b06787.tar.bz2 | |
pstore/ram: Add kmsg hlen zero check to ramoops_pstore_write()
If zero-length header happened in ramoops_write_kmsg_hdr(), that means
we will not be able to read back dmesg record later, since it will be
treated as invalid header in ramoops_pstore_read(). So we should not
execute the following code but return the error.
Signed-off-by: Yue Hu <huyue2@yulong.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
| -rw-r--r-- | fs/pstore/ram.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c index d06e2f3e3bec..ec0e1da0596a 100644 --- a/fs/pstore/ram.c +++ b/fs/pstore/ram.c @@ -425,6 +425,9 @@ static int notrace ramoops_pstore_write(struct pstore_record *record) /* Build header and append record contents. */ hlen = ramoops_write_kmsg_hdr(prz, record); + if (!hlen) + return -ENOMEM; + size = record->size; if (size + hlen > prz->buffer_size) size = prz->buffer_size - hlen; |