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authorKees Cook <keescook@chromium.org>2018-03-06 15:15:24 -0800
committerKees Cook <keescook@chromium.org>2018-03-06 15:15:24 -0800
commit555974068ee533e8e0c6093ec7ca1682057aa4c1 (patch)
tree63a9acedb92849eeb0fa21f4fb9d3bb498b1b509
parent239b716199d9aff0d09444b0086e23aacd6bd445 (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>
-rw-r--r--fs/pstore/platform.c18
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)