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| author | Anton Vorontsov <anton.vorontsov@linaro.org> | 2012-06-19 06:15:52 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-06-21 03:15:22 +0400 |
| commit | beeb94321a7a6d493b4a06ff0cd771f09f41c35e (patch) | |
| tree | ae276de7228bf62512d5a9ce3b65c76017a6def0 /fs/pstore | |
| parent | 90b58d96907e0a45555429c0d3a79c85cea4b9fc (diff) | |
| download | linux-beeb94321a7a6d493b4a06ff0cd771f09f41c35e.tar.xz | |
pstore/ram_core: Proper checking for post_init errors (e.g. improper ECC size)
We will implement variable-sized ECC buffers soon, so post_init routine
might fail much more likely, so we'd better check for its errors.
To make error handling simple, modify persistent_ram_free() to it be safe
at all times.
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/pstore')
| -rw-r--r-- | fs/pstore/ram_core.c | 22 |
1 files changed, 15 insertions, 7 deletions
diff --git a/fs/pstore/ram_core.c b/fs/pstore/ram_core.c index 26531856daf8..f62ebf2dfed7 100644 --- a/fs/pstore/ram_core.c +++ b/fs/pstore/ram_core.c @@ -427,11 +427,17 @@ static int __devinit persistent_ram_post_init(struct persistent_ram_zone *prz, void persistent_ram_free(struct persistent_ram_zone *prz) { - if (pfn_valid(prz->paddr >> PAGE_SHIFT)) { - vunmap(prz->vaddr); - } else { - iounmap(prz->vaddr); - release_mem_region(prz->paddr, prz->size); + if (!prz) + return; + + if (prz->vaddr) { + if (pfn_valid(prz->paddr >> PAGE_SHIFT)) { + vunmap(prz->vaddr); + } else { + iounmap(prz->vaddr); + release_mem_region(prz->paddr, prz->size); + } + prz->vaddr = NULL; } persistent_ram_free_old(prz); kfree(prz); @@ -454,10 +460,12 @@ struct persistent_ram_zone * __devinit persistent_ram_new(phys_addr_t start, if (ret) goto err; - persistent_ram_post_init(prz, ecc); + ret = persistent_ram_post_init(prz, ecc); + if (ret) + goto err; return prz; err: - kfree(prz); + persistent_ram_free(prz); return ERR_PTR(ret); } |