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discover_cached_paths() should not corrupt nvlist string value

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discover_cached_paths() will write a NULL into a string from a nvlist to
use it as a substring, but does not restore it before return. This
corrupts the nvlist. It should be harmless unless the string is needed
again later, but we should not do this, so let us fix it.

Reviewed-by: Tino Reichardt <milky-zfs@mcmilk.de>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Richard Yao <richard.yao@alumni.stonybrook.edu>
Closes #14612
This commit is contained in:
Richard Yao 2023-03-12 12:30:21 -04:00 committed by Brian Behlendorf
parent 47a7062772
commit 50f6934b9c
1 changed files with 11 additions and 4 deletions
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15
lib/libzutil/zutil_import.c
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@ -1564,12 +1564,19 @@ discover_cached_paths(libpc_handle_t *hdl, nvlist_t *nv,
* our directory cache.
*/
if (nvlist_lookup_string(nv, ZPOOL_CONFIG_PATH, &path) == 0) {
if ((dl = zfs_dirnamelen(path)) == -1)
int ret;
char c = '\0';
if ((dl = zfs_dirnamelen(path)) == -1) {
path = (char *)".";
else
} else {
c = path[dl];
path[dl] = '\0';
return (zpool_find_import_scan_dir(hdl, lock, cache,
path, 0));
}
ret = zpool_find_import_scan_dir(hdl, lock, cache,
path, 0);
if (c != '\0')
path[dl] = c;
return (ret);
}
return (0);
}