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fs: fix FAT name extraction

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The long name apparently can be accumulated using multiple
13-byte slots.  Unfortunately we never checked how many we
can actually fit in the buffer we are reading to.

Signed-off-by: Patrick Wildt <patrick@blueri.se>
This commit is contained in:
Patrick Wildt 2018-11-26 15:58:13 +01:00 committed by Tom Rini
parent cd80a4fe61
commit 8b021bb956
1 changed files with 3 additions and 0 deletions
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fs/fat/fat.c
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@ -821,6 +821,9 @@ static dir_entry *extract_vfat_name(fat_itr *itr)
slot2str((dir_slot *)dent, buf, &idx);
if (n + idx >= sizeof(itr->l_name))
return NULL;
/* shift accumulated long-name up and copy new part in: */
memmove(itr->l_name + idx, itr->l_name, n);
memcpy(itr->l_name, buf, idx);