heap corruption in du

[Mikulas Patocka]

Hi

I got this message from du from coreutils 5.2.1:

du: fts_read failed: No such file or directory
*** glibc detected *** corrupted double-linked list: 0x0806c390 ***

I was sometimes able reproduce on an AFS filesystem. It turned out that 
AFS filesystem changes inode numbers or device numbers, so 
fts_safe_changedir called at the end of fts_read fails. fts_read sets 
FTS_STOP, returns NULL and lets fts_cur to point to just freed entry few 
lines above (free(tmp)). The next call to fts_close will do a double-free.

This patch fixes the problem in this situation (and other possible 
scenarios resulting from various syscalls failing) --- however you should 
better go through the whole code for handling of fts tree and check it.

Mikulas

du-patch
Description: du-patch