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MTD: Prevent a read from eraseregions[-1]

Message ID 4A7E9868.6070505@gmail.com
State Accepted
Commit ebf2e93036907fe2a7ddab942aa63d35f97f3b2b
Headers show

Commit Message

roel kluin Aug. 9, 2009, 9:35 a.m. UTC 
If the erase region was found in the first iteration we read from
eraseregions[-1]

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
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Patch

diff --git a/drivers/mtd/mtdconcat.c b/drivers/mtd/mtdconcat.c
index 792b547..db6de74 100644
--- a/drivers/mtd/mtdconcat.c
+++ b/drivers/mtd/mtdconcat.c
@@ -427,7 +427,7 @@  static int concat_erase(struct mtd_info *mtd, struct erase_info *instr)
 		 * to-be-erased area begins. Verify that the starting
 		 * offset is aligned to this region's erase size:
 		 */
-		if (instr->addr & (erase_regions[i].erasesize - 1))
+		if (i < 0 || instr->addr & (erase_regions[i].erasesize - 1))
 			return -EINVAL;
 
 		/*
@@ -440,8 +440,8 @@  static int concat_erase(struct mtd_info *mtd, struct erase_info *instr)
 		/*
 		 * check if the ending offset is aligned to this region's erase size
 		 */
-		if ((instr->addr + instr->len) & (erase_regions[i].erasesize -
-						  1))
+		if (i < 0 || ((instr->addr + instr->len) &
+					(erase_regions[i].erasesize - 1)))
 			return -EINVAL;
 	}