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ufs_trunc_branch(): never call with offsets != NULL && depth2 == 0 

For calls in __ufs_truncate_blocks() it's just a matter of not
incrementing offsets[0] and not making that call - immediately
following loop will be executed one extra time and we'll be just
fine.  For recursive call in ufs_trunc_branch() itself, just
assing NULL to offsets if we would be about to make such call.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2015-06-18 16:05:18 -04:00
parent 42432739b5
commit 97e0f8f87c
1 changed files with 6 additions and 3 deletions
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9
fs/ufs/inode.c
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@ -1075,7 +1075,7 @@ static void ufs_trunc_branch(struct inode *inode, unsigned *offsets, int depth2,
struct ufs_inode_info *ufsi = UFS_I(inode);
struct ufs_buffer_head *ubh;
u64 tmp;
bool free_it = !offsets || !depth2;
bool free_it = !offsets;
unsigned from = offsets ? *offsets++ : 0;
unsigned i;
@ -1091,9 +1091,11 @@ static void ufs_trunc_branch(struct inode *inode, unsigned *offsets, int depth2,
}
if (--depth) {
if (!--depth2)
offsets = NULL;
for (i = from ; i < uspi->s_apb ; i++, offsets = NULL) {
void *ind = ubh_get_data_ptr(uspi, ubh, i);
ufs_trunc_branch(inode, offsets, depth2 - 1, depth, ind);
ufs_trunc_branch(inode, offsets, depth2, depth, ind);
ubh_mark_buffer_dirty(ubh);
}
} else {
@ -1237,7 +1239,8 @@ static void __ufs_truncate_blocks(struct inode *inode)
ufs_trunc_direct(inode);
offsets[0] = UFS_IND_BLOCK;
} else {
ufs_trunc_branch(inode, offsets + 1, depth2, depth - 1,
if (depth2)
ufs_trunc_branch(inode, offsets + 1, depth2, depth - 1,
ufs_get_direct_data_ptr(uspi, ufsi, offsets[0]++));
}
for (i = offsets[0]; i <= UFS_TIND_BLOCK; i++) {