diff options
author | Kees Cook <keescook@chromium.org> | 2018-03-06 15:15:24 -0800 |
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committer | Kees Cook <keescook@chromium.org> | 2018-03-06 15:15:24 -0800 |
commit | 555974068ee533e8e0c6093ec7ca1682057aa4c1 (patch) | |
tree | 63a9acedb92849eeb0fa21f4fb9d3bb498b1b509 /fs | |
parent | 239b716199d9aff0d09444b0086e23aacd6bd445 (diff) |
pstore: Avoid size casts for 842 compression
Instead of casting, make sure we don't end up with giant values and just
perform regular assignments with unsigned int instead of re-cast size_t.
Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'fs')
-rw-r--r-- | fs/pstore/platform.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c index 19aaefeb052f..df54dd87598a 100644 --- a/fs/pstore/platform.c +++ b/fs/pstore/platform.c @@ -452,27 +452,37 @@ static const struct pstore_zbackend backend_lz4hc = { static int compress_842(const void *in, void *out, size_t inlen, size_t outlen) { int ret; + unsigned int size; - ret = sw842_compress(in, inlen, out, (unsigned int *)&outlen, workspace); + if (outlen > UINT_MAX) + return -EIO; + size = outlen; + + ret = sw842_compress(in, inlen, out, &size, workspace); if (ret) { pr_err("sw842_compress error; compression failed!\n"); return ret; } - return outlen; + return size; } static int decompress_842(void *in, void *out, size_t inlen, size_t outlen) { int ret; + unsigned int size; - ret = sw842_decompress(in, inlen, out, (unsigned int *)&outlen); + if (outlen > UINT_MAX) + return -EIO; + size = outlen; + + ret = sw842_decompress(in, inlen, out, &size); if (ret) { pr_err("sw842_decompress error, ret = %d!\n", ret); return ret; } - return outlen; + return size; } static void allocate_842(void) |