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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>
This commit is contained in:
Kees Cook 2018-03-06 15:15:24 -08:00
parent 239b716199
commit 555974068e
1 changed files with 14 additions and 4 deletions
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18
fs/pstore/platform.c
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@ -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)