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authorMichael Buesch <mb@bu3sch.de>2009-07-20 22:58:44 +0000
committerHelge Deller <deller@gmx.de>2009-08-02 12:35:52 +0200
commit6b4dbcd86a9d464057fcc7abe4d0574093071fcc (patch)
treedd1dc64562db85a382a6118335821c311809cac3
parent450d6e306b4717bfae11218a02648509baf04ce1 (diff)
parisc: isa-eeprom - Fix loff_t usage
loff_t is a signed type. If userspace passes a negative ppos, the "count" range check is weakened. "count"s bigger than HPEE_MAX_LENGTH will pass the check. Also, if ppos is negative, the readb(eisa_eeprom_addr + *ppos) will poke in random memory. Signed-off-by: Michael Buesch <mb@bu3sch.de> Cc: stable@kernel.org Signed-off-by: Helge Deller <deller@gmx.de>
-rw-r--r--drivers/parisc/eisa_eeprom.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/parisc/eisa_eeprom.c b/drivers/parisc/eisa_eeprom.c
index 685d94e69d4..8c0b26e9b98 100644
--- a/drivers/parisc/eisa_eeprom.c
+++ b/drivers/parisc/eisa_eeprom.c
@@ -55,7 +55,7 @@ static ssize_t eisa_eeprom_read(struct file * file,
ssize_t ret;
int i;
- if (*ppos >= HPEE_MAX_LENGTH)
+ if (*ppos < 0 || *ppos >= HPEE_MAX_LENGTH)
return 0;
count = *ppos + count < HPEE_MAX_LENGTH ? count : HPEE_MAX_LENGTH - *ppos;