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CVE-2019-13105: ext4: fix double-free in ext4_cache_read

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ext_cache_read doesn't null cache->buf, after freeing, which results
in a later function double-freeing it. This patch fixes
ext_cache_read to call ext_cache_fini instead of free.

Signed-off-by: Paul Emge <paulemge@forallsecure.com>
This commit is contained in:
Paul Emge 2019-07-08 16:37:04 -07:00 • committed by Tom Rini
parent 232e2f4fd9
commit 6e5a79de65
1 changed files with 1 additions and 1 deletions
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2
fs/ext4/ext4fs.c
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@ -286,7 +286,7 @@ int ext_cache_read(struct ext_block_cache *cache, lbaint_t block, int size)
if (!cache->buf)
return 0;
if (!ext4fs_devread(block, 0, size, cache->buf)) {
free(cache->buf);
ext_cache_fini(cache);
return 0;
}
cache->block = block;