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pstore fix for rare error path 

- Fix label allocation lifetime/visibility to avoid further mistakes
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 Comment: Kees Cook <kees@outflux.net>
 
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Merge tag 'pstore-v5.5-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull pstore fix from Kees Cook:
 "Cengiz Can forwarded a Coverity report about more problems with a rare
  pstore initialization error path, so the allocation lifetime was
  rearranged to avoid needing to share the kfree() responsibilities
  between caller and callee"

* tag 'pstore-v5.5-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  pstore/ram: Regularize prz label allocation lifetime
This commit is contained in:
Linus Torvalds 2020-01-09 21:42:05 -08:00
parent 6d25ef7735 e163fdb3f7
commit bef1d88263
2 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
fs/pstore/ram.c
View File

@ -583,12 +583,12 @@ static int ramoops_init_przs(const char *name,
prz_ar[i] = persistent_ram_new(*paddr, zone_sz, sig,
&cxt->ecc_info,
cxt->memtype, flags, label);
kfree(label);
if (IS_ERR(prz_ar[i])) {
err = PTR_ERR(prz_ar[i]);
dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n",
name, record_size,
(unsigned long long)*paddr, err);
kfree(label);
while (i > 0) {
i--;
@ -629,12 +629,12 @@ static int ramoops_init_prz(const char *name,
label = kasprintf(GFP_KERNEL, "ramoops:%s", name);
*prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info,
cxt->memtype, PRZ_FLAG_ZAP_OLD, label);
kfree(label);
if (IS_ERR(*prz)) {
int err = PTR_ERR(*prz);
dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n",
name, sz, (unsigned long long)*paddr, err);
kfree(label);
return err;
}

2
fs/pstore/ram_core.c
View File

@ -574,7 +574,7 @@ struct persistent_ram_zone *persistent_ram_new(phys_addr_t start, size_t size,
/* Initialize general buffer state. */
raw_spin_lock_init(&prz->buffer_lock);
prz->flags = flags;
prz->label = label;
prz->label = kstrdup(label, GFP_KERNEL);
ret = persistent_ram_buffer_map(start, size, prz, memtype);
if (ret)