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net: pktgen: fix access outside of user given buffer in pktgen_thread_write()

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[ Upstream commit 425e64440ad0a2f03bdaf04be0ae53dededbaa77 ]

Honour the user given buffer size for the strn_len() calls (otherwise
strn_len() will access memory outside of the user given buffer).

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250219084527.20488-8-ps.report@gmx.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Peter Seiderer 2025-02-19 09:45:27 +01:00 • committed by Greg Kroah-Hartman
commit a3d89f1cfe
1 changed files with 4 additions and 3 deletions
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7
net/core/pktgen.c
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@ -1770,8 +1770,8 @@ static ssize_t pktgen_thread_write(struct file *file,
i = len;
/* Read variable name */
len = strn_len(&user_buffer[i], sizeof(name) - 1);
max = min(sizeof(name) - 1, count - i);
len = strn_len(&user_buffer[i], max);
if (len < 0)
return len;
@ -1801,7 +1801,8 @@ static ssize_t pktgen_thread_write(struct file *file,
if (!strcmp(name, "add_device")) {
char f[32];
memset(f, 0, 32);
len = strn_len(&user_buffer[i], sizeof(f) - 1);
max = min(sizeof(f) - 1, count - i);
len = strn_len(&user_buffer[i], max);
if (len < 0) {
ret = len;
goto out;