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Cleaned the tail of compressed buffer before writing a full cluster 

When appending to an existing compressed file, the last block must first
be decompressed. When doing so, clear the tail of buffer in order to not
leak unrelated data.
edge.strict_endians^2
Jean-Pierre André 2021-05-17 15:38:20 +03:00 committed by Erik Larsson
parent 02e199978b
commit 218d93b37b
1 changed files with 3 additions and 1 deletions
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4
libntfs-3g/compress.c
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@ -1618,7 +1618,7 @@ static int ntfs_read_append(ntfs_attr *na, const runlist_element *rl,
*/
static s32 ntfs_flush(ntfs_attr *na, runlist_element *rl, s64 offs,
const char *outbuf, s32 count, BOOL compress,
char *outbuf, s32 count, BOOL compress,
BOOL appending, VCN *update_from)
{
s32 rounded;
@ -1639,6 +1639,8 @@ static s32 ntfs_flush(ntfs_attr *na, runlist_element *rl, s64 offs,
if (!compress) {
clsz = 1 << na->ni->vol->cluster_size_bits;
rounded = ((count - 1) | (clsz - 1)) + 1;
if (rounded > count)
memset(&outbuf[count], 0, rounded - count);
written = write_clusters(na->ni->vol, rl,
offs, rounded, outbuf);
if (written != rounded)