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smc: some potential use after free bugs

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Say we got really unlucky and these failed on the last iteration, then
it could lead to a use after free bug.

Fixes: cd6851f303 ("smc: remote memory buffers (RMBs)")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dan Carpenter 2017-01-30 10:55:04 +01:00 committed by David S. Miller
parent 1930b60352
commit cdaf25dfc0
1 changed files with 5 additions and 0 deletions
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5
net/smc/smc_core.c
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@ -532,6 +532,7 @@ int smc_sndbuf_create(struct smc_sock *smc)
__GFP_NORETRY);
if (!sndbuf_desc->cpu_addr) {
kfree(sndbuf_desc);
sndbuf_desc = NULL;
/* if send buffer allocation has failed,
* try a smaller one
*/
@ -543,6 +544,7 @@ int smc_sndbuf_create(struct smc_sock *smc)
if (rc) {
kfree(sndbuf_desc->cpu_addr);
kfree(sndbuf_desc);
sndbuf_desc = NULL;
continue; /* if mapping failed, try smaller one */
}
sndbuf_desc->used = 1;
@ -596,6 +598,7 @@ int smc_rmb_create(struct smc_sock *smc)
__GFP_NORETRY);
if (!rmb_desc->cpu_addr) {
kfree(rmb_desc);
rmb_desc = NULL;
/* if RMB allocation has failed,
* try a smaller one
*/
@ -607,6 +610,7 @@ int smc_rmb_create(struct smc_sock *smc)
if (rc) {
kfree(rmb_desc->cpu_addr);
kfree(rmb_desc);
rmb_desc = NULL;
continue; /* if mapping failed, try smaller one */
}
rc = smc_ib_get_memory_region(lgr->lnk[SMC_SINGLE_LINK].roce_pd,
@ -619,6 +623,7 @@ int smc_rmb_create(struct smc_sock *smc)
DMA_FROM_DEVICE);
kfree(rmb_desc->cpu_addr);
kfree(rmb_desc);
rmb_desc = NULL;
continue;
}
rmb_desc->used = 1;