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udf: Fix lost indirect extent block 

When inode ends with empty indirect extent block and we extended that
file, udf_do_extend_file() ended up just overwriting pointer to it with
another extent and thus effectively leaking the block and also
corruptiong length of allocation descriptors.

Fix the problem by properly following into next indirect extent when it
is present.

Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara 2015-12-23 18:05:03 +01:00
parent fcea62babc
commit 6c37157874
1 changed files with 10 additions and 1 deletions
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11
fs/udf/inode.c
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@ -539,9 +539,18 @@ static int udf_do_extend_file(struct inode *inode,
udf_add_aext(inode, last_pos, &last_ext->extLocation,
last_ext->extLength, 1);
count++;
} else
} else {
struct kernel_lb_addr tmploc;
uint32_t tmplen;
udf_write_aext(inode, last_pos, &last_ext->extLocation,
last_ext->extLength, 1);
/*
* We've rewritten the last extent but there may be empty
* indirect extent after it - enter it.
*/
udf_next_aext(inode, last_pos, &tmploc, &tmplen, 0);
}
/* Managed to do everything necessary? */
if (!blocks)