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authorShehjar Tikoo <shehjart@gluster.com>2009-06-18 05:33:27 +0000
committerAnand V. Avati <avati@dev.gluster.com>2009-06-18 13:08:04 -0700
commitbb451c37bc05c8a33130e6b93020378d742f0ca2 (patch)
tree4de29e9fbd09302efa811457f4d9950e4604ee67 /libglusterfs/src/fd.c
parent617de1c718d4f082c8a8cf86c258284f5c918b2c (diff)
libglusterfs: Prevent gf_fd_put'ing of unallocated fd
Signed-off-by: Anand V. Avati <avati@dev.gluster.com>
Diffstat (limited to 'libglusterfs/src/fd.c')
-rw-r--r--libglusterfs/src/fd.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/libglusterfs/src/fd.c b/libglusterfs/src/fd.c
index f67bdc82802..b28fb047e4a 100644
--- a/libglusterfs/src/fd.c
+++ b/libglusterfs/src/fd.c
@@ -343,11 +343,21 @@ gf_fd_put (fdtable_t *fdtable, int32_t fd)
pthread_mutex_lock (&fdtable->lock);
{
fde = &fdtable->fdentries[fd];
- fdptr = fde->fd;
+ /* If the entry is not allocated, put operation must return
+ * without doing anything.
+ * This has the potential of masking out any bugs in a user of
+ * fd that ends up calling gf_fd_put twice for the same fd or
+ * for an unallocated fd, but thats a price we have to pay for
+ * ensuring sanity of our fd-table.
+ */
+ if (fde->next_free != GF_FDENTRY_ALLOCATED)
+ goto unlock_out;
+ fdptr = fde->fd;
fde->fd = NULL;
fde->next_free = fdtable->first_free;
fdtable->first_free = fd;
}
+unlock_out:
pthread_mutex_unlock (&fdtable->lock);
if (fdptr) {