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authorLinus Torvalds2013-02-05 20:50:11 +1100
committerLinus Torvalds2013-02-05 20:50:11 +1100
commitfe547d7714783ff77719f05a6712554cb4eeecc0 (patch)
tree6b25e2820818e732b4774f4e684c1a9a7830b38f
parent3296944e29a048c06c5d724ef5c2c8c6e1297161 (diff)
parentd4b0bcf32b946590afd29e202d6a399b84fe6c67 (diff)
Merge branch 'fix-max-write' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/linux-dlm
Pull dlm fix from David Teigland: "Thanks to Jana who reported the problem and was able to test this fix so quickly." This fixes an incorrect size check that triggered for CONFIG_COMPAT whether the code was actually doing compat or not. The incorrect write size check broke userland (clvmd) when maximum resource name lengths are used. * 'fix-max-write' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/linux-dlm: dlm: check the write size from user
-rw-r--r--fs/dlm/user.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/fs/dlm/user.c b/fs/dlm/user.c
index 7ff49852b0cb..911649a47dd5 100644
--- a/fs/dlm/user.c
+++ b/fs/dlm/user.c
@@ -503,11 +503,11 @@ static ssize_t device_write(struct file *file, const char __user *buf,
#endif
return -EINVAL;
-#ifdef CONFIG_COMPAT
- if (count > sizeof(struct dlm_write_request32) + DLM_RESNAME_MAXLEN)
-#else
+ /*
+ * can't compare against COMPAT/dlm_write_request32 because
+ * we don't yet know if is64bit is zero
+ */
if (count > sizeof(struct dlm_write_request) + DLM_RESNAME_MAXLEN)
-#endif
return -EINVAL;
kbuf = kzalloc(count + 1, GFP_NOFS);