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| author | Zhang Yanfei <zhangyanfei@cn.fujitsu.com> | 2013-02-27 17:03:31 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-02-27 19:10:12 -0800 |
| commit | 8c333ac2e4946a673b54f974d75397c947569c29 (patch) | |
| tree | 30ff21ecad4f62726ac2a90dbb9cc6e60a5b9b95 | |
| parent | b92e7e0daed31389ff5ad9f558ef1284c846f6ee (diff) | |
| download | op-kernel-dev-8c333ac2e4946a673b54f974d75397c947569c29.zip op-kernel-dev-8c333ac2e4946a673b54f974d75397c947569c29.tar.gz | |
kexec: avoid freeing NULL pointer in image_crash_alloc()
Though there is no error if we free a NULL pointer, I think we could
avoid this behaviour. Change the code a little in kimage_crash_alloc()
could avoid this kind of unnecessary free.
Signed-off-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Sasha Levin <sasha.levin@oracle.com>
Reviewed-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | kernel/kexec.c | 15 |
1 files changed, 7 insertions, 8 deletions
diff --git a/kernel/kexec.c b/kernel/kexec.c index 6b7455e..bddd3d7 100644 --- a/kernel/kexec.c +++ b/kernel/kexec.c @@ -316,7 +316,7 @@ static int kimage_crash_alloc(struct kimage **rimage, unsigned long entry, mend = mstart + image->segment[i].memsz - 1; /* Ensure we are within the crash kernel limits */ if ((mstart < crashk_res.start) || (mend > crashk_res.end)) - goto out; + goto out_free; } /* @@ -329,16 +329,15 @@ static int kimage_crash_alloc(struct kimage **rimage, unsigned long entry, get_order(KEXEC_CONTROL_PAGE_SIZE)); if (!image->control_code_page) { printk(KERN_ERR "Could not allocate control_code_buffer\n"); - goto out; + goto out_free; } - result = 0; -out: - if (result == 0) - *rimage = image; - else - kfree(image); + *rimage = image; + return 0; +out_free: + kfree(image); +out: return result; } |
