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infra: safeguard disk space computation

This commit is contained in:
Thomas Schoebel-Theuer 2019-09-02 12:24:52 +02:00 committed by Thomas Schoebel-Theuer
parent 303bcb1fec
commit 87963f672e
1 changed files with 9 additions and 4 deletions
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13
kernel/sy_old/sy_generic.c
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@ -814,14 +814,19 @@ EXPORT_SYMBOL_GPL(mars_lchown);
loff_t _compute_space(struct kstatfs *kstatfs, loff_t raw_val)
{
int fsize = kstatfs->f_frsize;
u64 fsize = kstatfs->f_frsize;
if (fsize <= 0)
fsize = kstatfs->f_bsize;
MARS_INF("fsize = %d raw_val = %lld\n", fsize, raw_val);
// illegal values? cannot do anything....
MARS_DBG("fsize = %llu raw_val = %lld\n", fsize, raw_val);
/* Implausible value:
* Guess, use safe side from old Unix...
*/
if (fsize <= 0)
return 0;
fsize = 512;
// prevent intermediate integer overflows
if (fsize <= 1024)