linux-ext4 - [Bug 202897] BUG: unable to handle kernel paging request at _

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Message-ID: <bug-202897-13602-hcLvm7U5fI@https.bugzilla.kernel.org/>
Date:   Wed, 20 Mar 2019 00:23:54 +0000
From:   bugzilla-daemon@...zilla.kernel.org
To:     linux-ext4@...r.kernel.org
Subject: [Bug 202897] BUG: unable to handle kernel paging request at
 __memmove

https://bugzilla.kernel.org/show_bug.cgi?id=202897

--- Comment #4 from phoonchiang (389387252@...com) ---
The following patch can fix this bug, but i'm not sure it is the best way 
to fix it.


diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index 86ed9c6..fd2ebba 100644
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -1695,7 +1695,7 @@ static int ext4_xattr_set_entry(struct ext4_xattr_info
*i,

        /* No failures allowed past this point. */

-       if (!s->not_found && here->e_value_size && here->e_value_offs) {
+       if (!s->not_found && here->e_value_size && here->e_value_offs &&
!here->e_value_inum) {
                /* Remove the old value. */
                void *first_val = s->base + min_offs;
                size_t offs = le16_to_cpu(here->e_value_offs);

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