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[SCSI] target: Avoid mem leak and needless work in transport_generic_get_mem

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In drivers/target/target_core_transport.c::transport_generic_get_mem()
there are a few potential memory leaks in the error paths. This patch
makes sure that we free previously allocated memory when other allocations
fail.  It also moves some work (INIT_LIST_HEAD() and assignment to
se_mem->se_len) below all the allocations so that if something fails we
don't do the work at all.

Signed-off-by: Jesper Juhl <jj@chaosbits.net>
Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Jesper Juhl 2011-03-14 04:06:05 -07:00 committed by James Bottomley
parent 5c6cd61319
commit 872105689e
1 changed files with 6 additions and 3 deletions
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9
drivers/target/target_core_transport.c
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@ -4357,11 +4357,9 @@ transport_generic_get_mem(struct se_cmd *cmd, u32 length, u32 dma_size)
printk(KERN_ERR "Unable to allocate struct se_mem\n");
goto out;
}
INIT_LIST_HEAD(&se_mem->se_list);
se_mem->se_len = (length > dma_size) ? dma_size : length;
/* #warning FIXME Allocate contigous pages for struct se_mem elements */
se_mem->se_page = (struct page *) alloc_pages(GFP_KERNEL, 0);
se_mem->se_page = alloc_pages(GFP_KERNEL, 0);
if (!(se_mem->se_page)) {
printk(KERN_ERR "alloc_pages() failed\n");
goto out;
@ -4372,6 +4370,8 @@ transport_generic_get_mem(struct se_cmd *cmd, u32 length, u32 dma_size)
printk(KERN_ERR "kmap_atomic() failed\n");
goto out;
}
INIT_LIST_HEAD(&se_mem->se_list);
se_mem->se_len = (length > dma_size) ? dma_size : length;
memset(buf, 0, se_mem->se_len);
kunmap_atomic(buf, KM_IRQ0);
@ -4390,6 +4390,9 @@ transport_generic_get_mem(struct se_cmd *cmd, u32 length, u32 dma_size)
return 0;
out:
if (se_mem)
__free_pages(se_mem->se_page, 0);
kmem_cache_free(se_mem_cache, se_mem);
return -1;
}