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authorAnand Avati <avati@gluster.com>2009-12-01 07:02:02 +0000
committerAnand V. Avati <avati@dev.gluster.com>2009-12-01 05:45:55 -0800
commitd2a30ec4aaeaa546f6370a1377c44574ada5edbc (patch)
treea2330f92f6f82abbe9f7ee2ed2a857f26fab539a /xlators
parentd7e0bf1757e5fae23bce3d09cd0d9fbbd822a067 (diff)
stat-prefetch: fix unsafe reference to @local in sp_lookup_cbk
stat-prefetch uses the main syscall frame for performing lookup on demand. this causes a potential reference to a freed local in sp_lookup_cbk after resuming the main syscall frame (which could have unwound and destroyed) Signed-off-by: Anand V. Avati <avati@blackhole.gluster.com> Signed-off-by: Anand V. Avati <avati@dev.gluster.com> BUG: 242 (If any of the writes fail, write-behind should not wait till the fd is closed for reporting errors) URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=242
Diffstat (limited to 'xlators')
-rw-r--r--xlators/performance/stat-prefetch/src/stat-prefetch.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/xlators/performance/stat-prefetch/src/stat-prefetch.c b/xlators/performance/stat-prefetch/src/stat-prefetch.c
index a1322ee47..bf328bb77 100644
--- a/xlators/performance/stat-prefetch/src/stat-prefetch.c
+++ b/xlators/performance/stat-prefetch/src/stat-prefetch.c
@@ -577,6 +577,7 @@ sp_lookup_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
call_stub_t *stub = NULL, *tmp = NULL;
sp_local_t *local = NULL;
sp_cache_t *cache = NULL;
+ int need_unwind = 0;
INIT_LIST_HEAD (&waiting_ops);
@@ -595,6 +596,9 @@ sp_lookup_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
}
}
+ if (local && local->is_lookup)
+ need_unwind = 1;
+
ret = inode_ctx_get (inode, this, &value);
if (ret == 0) {
inode_ctx = (sp_inode_ctx_t *)(long)value;
@@ -626,7 +630,7 @@ sp_lookup_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
}
out:
- if ((local != NULL) && (local->is_lookup)) {
+ if (need_unwind) {
SP_STACK_UNWIND (lookup, frame, op_ret, op_errno, inode, buf,
dict, postparent);
}