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netlabel: handle sparse category maps in netlbl_catmap_getlong()

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In cases where the category bitmap is sparse enough that gaps exist
between netlbl_lsm_catmap structs, callers to netlbl_catmap_getlong()
could find themselves prematurely ending their search through the
category bitmap.  Further, the methods used to calculate the 'idx'
and 'off' values were incorrect for bitmaps this large.  This patch
changes the netlbl_catmap_getlong() behavior so that it always skips
over gaps and calculates the index and offset values correctly.

Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Paul Moore 2016-06-09 10:56:02 -04:00
parent 8bebe88c09
commit 50b8629a60
1 changed files with 4 additions and 5 deletions
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9
net/netlabel/netlabel_kapi.c
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@ -609,20 +609,19 @@ int netlbl_catmap_getlong(struct netlbl_lsm_catmap *catmap,
off = catmap->startbit;
*offset = off;
}
iter = _netlbl_catmap_getnode(&catmap, off, _CM_F_NONE, 0);
iter = _netlbl_catmap_getnode(&catmap, off, _CM_F_WALK, 0);
if (iter == NULL) {
*offset = (u32)-1;
return 0;
}
if (off < iter->startbit) {
off = iter->startbit;
*offset = off;
*offset = iter->startbit;
off = 0;
} else
off -= iter->startbit;
idx = off / NETLBL_CATMAP_MAPSIZE;
*bitmap = iter->bitmap[idx] >> (off % NETLBL_CATMAP_SIZE);
*bitmap = iter->bitmap[idx] >> (off % NETLBL_CATMAP_MAPSIZE);
return 0;
}