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fs: ubifs: Fix UBIFS decompression on 64 bit

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Add local size_t variable to crypto_comp_decompress as intermediate
storage for destination length to avoid memory corruption and incorrect
results on 64 bit targets.

This is what linux does for the various lz compression implementations.

Signed-off-by: Paul Davey <paul.davey@alliedtelesis.co.nz>
Cc: Heiko Schocher <hs@denx.de>
Tested-by: Heiko Schocher <hs@denx.de>
This commit is contained in:
Paul Davey 2018-11-05 18:09:29 +13:00 committed by Heiko Schocher
parent dd610e616c
commit e4aa10ba57
1 changed files with 3 additions and 1 deletions
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4
fs/ubifs/ubifs.c
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@ -125,6 +125,7 @@ crypto_comp_decompress(const struct ubifs_info *c, struct crypto_comp *tfm,
{
struct ubifs_compressor *compr = ubifs_compressors[tfm->compressor];
int err;
size_t tmp_len = *dlen;
if (compr->compr_type == UBIFS_COMPR_NONE) {
memcpy(dst, src, slen);
@ -132,11 +133,12 @@ crypto_comp_decompress(const struct ubifs_info *c, struct crypto_comp *tfm,
return 0;
}
err = compr->decompress(src, slen, dst, (size_t *)dlen);
err = compr->decompress(src, slen, dst, &tmp_len);
if (err)
ubifs_err(c, "cannot decompress %d bytes, compressor %s, "
"error %d", slen, compr->name, err);
*dlen = tmp_len;
return err;
return 0;