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ntfs: Fix PVS V595

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Check pointers against NULL befor using them.

Change-Id: I84fc7d60179fff46f78302e212bbcf7e5105126b
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2223
Reviewed-by: Jérôme Duval <[email protected]>
This commit is contained in:
Murai Takashi
2020-02-06 17:07:53 +00:00
committed by Jérôme Duval
parent ffd6c2f4bd
commit b8476a30d7
1 changed files with 12 additions and 7 deletions
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src/add-ons/kernel/file_systems/ntfs/volume_util.c
+12 -7
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@@ -64,17 +64,22 @@ static uint8 ntfs_count_bits(unsigned char byte, unsigned char shift)
int ntfs_calc_free_space(nspace *_ns) int ntfs_calc_free_space(nspace *_ns)
{ {
nspace *ns = (nspace*)_ns; nspace *ns = (nspace*)_ns;
ntfs_volume *vol = ns->ntvol; ntfs_volume *vol;
ntfs_attr *data = vol->lcnbmp_na; ntfs_attr *data;
s64 free_clusters = 0; s64 free_clusters = 0;
off_t pos = 0; off_t pos = 0;
size_t readed; size_t readed;
unsigned char *buf = NULL; unsigned char *buf;
if (ns == NULL || vol == NULL || data == NULL) if (ns == NULL)
return -1; return -1;
if (vol->lcnbmp_na == NULL) vol = ns->ntvol;
if (vol == NULL)
return -1;
data = vol->lcnbmp_na;
if (data == NULL)
return -1; return -1;
if (!(ns->state & NF_FreeClustersOutdate)) if (!(ns->state & NF_FreeClustersOutdate))