When num_ios goes from 1 to 0, a realloc(ios, 0); call is made.
This is equivalent to free(ios) and NULL is returned.
However, the previous logic in the code incorrectly discards this NULL
return value. When we next call new_io_handle(), realloc(ios, X) is
called with "ios" pointing to freed memory. This causes glibc to abort.
Correct this logic to detect the 1-to-0 case and handle it correctly.
Other cases are unchanged; there is still value in checking the
return value from realloc() as it also returns NULL on error.
Signed-off-by: Daniel Drake <dsd@laptop.org>
Reviewed-by: Alan Coopersmith <alan.coopersmith@oracle.com>
}
}
- new = realloc(ios, sizeof(struct pci_io_handle) * (num_ios - 1));
- if (new)
- ios = new;
num_ios--;
+ if (num_ios) {
+ new = realloc(ios, sizeof(struct pci_io_handle) * num_ios);
+ if (new)
+ ios = new;
+ } else {
+ free(ios);
+ ios = NULL;
+ }
}
_pci_hidden void