[JFFS2] Fix allocation of summary buffer

We can't use vmalloc for the buffer we use for writing summaries,
because some drivers may want to DMA from it. So limit the size to 64KiB
and use kmalloc for it instead.

Signed-off-by: David Woodhouse <[e-mail]>

fs/jffs2/summary.c

···
 
 int jffs2_sum_init(struct jffs2_sb_info *c)
 {
+	uint32_t sum_size = max_t(uint32_t, c->sector_size, MAX_SUMMARY_SIZE);
+
 	c->summary = kzalloc(sizeof(struct jffs2_summary), GFP_KERNEL);
 
 	if (!c->summary) {
···
 		return -ENOMEM;
 	}
 
-	c->summary->sum_buf = vmalloc(c->sector_size);
+	c->summary->sum_buf = kmalloc(sum_size, GFP_KERNEL);
 
 	if (!c->summary->sum_buf) {
 		JFFS2_WARNING("Can't allocate buffer for writing out summary information!\n");
···
 
 	jffs2_sum_disable_collecting(c->summary);
 
-	vfree(c->summary->sum_buf);
+	kfree(c->summary->sum_buf);
 	c->summary->sum_buf = NULL;
 
 	kfree(c->summary);
···
 /* Write summary data to flash - helper function for jffs2_sum_write_sumnode() */
 
 static int jffs2_sum_write_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
-					uint32_t infosize, uint32_t datasize, int padsize)
+				uint32_t infosize, uint32_t datasize, int padsize)
 {
 	struct jffs2_raw_summary isum;
 	union jffs2_sum_mem *temp;
···
 	void *wpage;
 	int ret;
 	size_t retlen;
+
+	if (padsize + datasize > MAX_SUMMARY_SIZE) {
+		/* It won't fit in the buffer. Abort summary for this jeb */
+		jffs2_sum_disable_collecting(c->summary);
+
+		JFFS2_WARNING("Summary too big (%d data, %d pad) in eraseblock at %08x\n",
+			      datasize, padsize, jeb->offset);
+		/* Non-fatal */
+		return 0;
+	}
+	/* Is there enough space for summary? */
+	if (padsize < 0) {
+		/* don't try to write out summary for this jeb */
+		jffs2_sum_disable_collecting(c->summary);
+
+		JFFS2_WARNING("Not enough space for summary, padsize = %d\n",
+			      padsize);
+		/* Non-fatal */
+		return 0;
+	}
 
 	memset(c->summary->sum_buf, 0xff, datasize);
 	memset(&isum, 0, sizeof(isum));
···
 {
 	int datasize, infosize, padsize;
 	struct jffs2_eraseblock *jeb;
-	int ret;
+	int ret = 0;
 
 	dbg_summary("called\n");
 
···
 	padsize = jeb->free_size - infosize;
 	infosize += padsize;
 	datasize += padsize;
-
-	/* Is there enough space for summary? */
-	if (padsize < 0) {
-		/* don't try to write out summary for this jeb */
-		jffs2_sum_disable_collecting(c->summary);
-
-		JFFS2_WARNING("Not enough space for summary, padsize = %d\n", padsize);
-		spin_lock(&c->erase_completion_lock);
-		return 0;
-	}
 
 	ret = jffs2_sum_write_data(c, jeb, infosize, datasize, padsize);
 	spin_lock(&c->erase_completion_lock);

fs/jffs2/summary.h

···
 #ifndef JFFS2_SUMMARY_H
 #define JFFS2_SUMMARY_H
 
+/* Limit summary size to 64KiB so that we can kmalloc it. If the summary
+   is larger than that, we have to just ditch it and avoid using summary
+   for the eraseblock in question... and it probably doesn't hurt us much
+   anyway. */
+#define MAX_SUMMARY_SIZE 65536
+
 #include <linux/uio.h>
 #include <linux/jffs2.h>