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authorJeff Layton <jlayton@redhat.com>2009-05-19 09:57:03 -0400
committerSteve French <sfrench@us.ibm.com>2009-05-19 11:31:20 -0400
commit8b6427a2a8f7dd43e9208fb33a3b116d66db4979 (patch)
tree51b3bcb46a36f3bbc9bfb5ea61cdf600b2233897 /fs/cifs/cifssmb.c
parentb41a080fa9f157d223c782ec3571cf46e34e91d6 (diff)
cifs: fix pointer initialization and checks in cifs_follow_symlink (try #4)
This is the third respin of the patch posted yesterday to fix the error handling in cifs_follow_symlink. It also includes a fix for a bogus NULL pointer check in CIFSSMBQueryUnixSymLink that Jeff Moyer spotted. It's possible for CIFSSMBQueryUnixSymLink to return without setting target_path to a valid pointer. If that happens then the current value to which we're initializing this pointer could cause an oops when it's kfree'd. This patch is a little more comprehensive than the last patches. It reorganizes cifs_follow_link a bit for (hopefully) better readability. It should also eliminate the uneeded allocation of full_path on servers without unix extensions (assuming they can get to this point anyway, of which I'm not convinced). On a side note, I'm not sure I agree with the logic of enabling this query even when unix extensions are disabled on the client. It seems like that should disable this as well. But, changing that is outside the scope of this fix, so I've left it alone for now. Reported-by: Jeff Moyer <jmoyer@redhat.com> Signed-off-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Jeff Moyer <jmoyer@redhat.com> Reviewed-by: Christoph Hellwig <hch@inraded.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
Diffstat (limited to 'fs/cifs/cifssmb.c')
-rw-r--r--fs/cifs/cifssmb.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 5759ba53dc96..d06260251c30 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -2475,7 +2475,7 @@ querySymLinkRetry:
2475 /* BB FIXME investigate remapping reserved chars here */ 2475 /* BB FIXME investigate remapping reserved chars here */
2476 *symlinkinfo = cifs_strndup_from_ucs(data_start, count, 2476 *symlinkinfo = cifs_strndup_from_ucs(data_start, count,
2477 is_unicode, nls_codepage); 2477 is_unicode, nls_codepage);
2478 if (!symlinkinfo) 2478 if (!*symlinkinfo)
2479 rc = -ENOMEM; 2479 rc = -ENOMEM;
2480 } 2480 }
2481 } 2481 }