From: Su Hui suhui@nfschina.com
stable inclusion from stable-v6.6.32 commit b1813c220b76f60b1727984794377c4aa849d4c1 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IB2SWG CVE: CVE-2024-50152
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit 19ebc1e6cab334a8193398d4152deb76019b5d34 ]
Clang static checker(scan-build) warning： fs/smb/client/smb2ops.c:1304:2: Attempt to free released memory. 1304 | kfree(ea); | ^~~~~~~~~
There is a double free in such case: 'ea is initialized to NULL' -> 'first successful memory allocation for ea' -> 'something failed, goto sea_exit' -> 'first memory release for ea' -> 'goto replay_again' -> 'second goto sea_exit before allocate memory for ea' -> 'second memory release for ea resulted in double free'.
Re-initialie 'ea' to NULL near to the replay_again label, it can fix this double free problem.
Fixes: 4f1fffa23769 ("cifs: commands that are retried should have replay flag set") Reviewed-by: Dan Carpenter dan.carpenter@linaro.org Signed-off-by: Su Hui suhui@nfschina.com Signed-off-by: Steve French stfrench@microsoft.com Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Yifan Qiao qiaoyifan4@huawei.com --- fs/smb/client/smb2ops.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/smb/client/smb2ops.c b/fs/smb/client/smb2ops.c index acd5d7d79352..38de3d593abc 100644 --- a/fs/smb/client/smb2ops.c +++ b/fs/smb/client/smb2ops.c @@ -1122,7 +1122,7 @@ smb2_set_ea(const unsigned int xid, struct cifs_tcon *tcon, struct cifs_fid fid; unsigned int size[1]; void *data[1]; - struct smb2_file_full_ea_info *ea = NULL; + struct smb2_file_full_ea_info *ea; struct smb2_query_info_rsp *rsp; int rc, used_len = 0; int retries = 0, cur_sleep = 1; @@ -1143,6 +1143,7 @@ smb2_set_ea(const unsigned int xid, struct cifs_tcon *tcon, if (!utf16_path) return -ENOMEM;
+ ea = NULL; resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER; vars = kzalloc(sizeof(*vars), GFP_KERNEL); if (!vars) {